CHRYSICHTHYS. 333 times. Head much depressed, 14 to 14 times as long as broad, rugose and striated above; occipital process rather broad, in contact with interneural shield; snout broadly rounded, projecting very slightly beyond lower jaw, 2 to 3 times diameter of eye, which is 6 to 9 times in length of head and 2 to 5 times in interocular width ; width of mouth once and 4 to twice in length of head; premaxillary band of teeth curved, 6 to 8 times as long as broad; vomero-pterygoid teeth forming a long and broad band narrowly interrupted in the middle; nasal barbel as Chrysichthys cranchit.
Type. 2.
long as ot a little longer than eye; maxillary barbel # to once length of head; outer mandibular barbel longer than inner, $ to # length of head. Gill-erakers moderate, 10-13 on lower part of anterior arch. Dorsal I 6, 15 to 14 times as distant from end of snout and from root of caudal; spine rugose but not serrated, about 4 length of head ; first and second soft rays longest, 2 to # length of head. Adipose fin 14 times as long as deep, its base a httle shorter than or nearly equal to that of the dorsal and 3 or a little less than 2 its distance from the latter. Anal 12-14, 8-10 rays branched. Pectoral spine about 4 length of head, very feebly denticulate on both sides in the adult, strongly serrated on inner side in the young. Caudal deeply notched, longest rays 2 to 23 times the median. Caudal peduncle 14 to 14 times as long as deep. Dark brown above, white beneath.
Total length 1000 millim.
Congo and Lake Tanganyika.
334 SILURIDA.
1. Hgr., type. Lower Congo. Capt. Tuckey (C.).
2. Nic. Coquilhatyille, Upp. Congo. M. P. Delhiez (C.). 3. Her. Kutu, L. Leopold II., Upp. Congo. 45 4-5. Ad. & yg. Monsembe, Upp. Congo. Rev. J. H. Weeks (C.). 6-7. Ye. Kondue, Kasai. M. Luja (C.).
8. Skel. Albertville, L. Tanganyika. Capt. Heeq (C.). 14. CHRYSICHTHYS PUNCTATUS.
Bouleng. Ann. Mus. Congo, Zool. i. p. 107, pl. xlii. fig. 1 (1899), and Poiss. Bass. Congo, p. 287 (1901).
Depth of body 5 to 53 times in total length, length of head 3 to 3} times. Head moderately depressed, 1$ times as long as broad, rugose above; occipital process narrow, in contact with interneural shield ; snout rounded, projecting very slightly beyond mouth, about 4 length of head; eye 4 times in length of head and 14 times in interocular width ; width of mouth about 4 length of head ; premaxillary band of Chrysichthys punctatus.
Type (A.M. C.), 2.
teeth feebly curved, 4 to 5 times as long as broad; vomero-pterygoid teeth forming a long and narrow band interrupted in the middle; nasal barbel a little shorter than eye ; maxillary barbel ? to $ length of head ; outer mandibular barbel 14 times as long as inner, and # to # length of head. Gill-rakers moderate, 13 on lower part of anterior arch. Dorsal
CHRYSICHTHYS. 335 I 6, 14 times as distant from root of caudal as from end of snout ; spine feebly serrated behind, 3 to # length of head; first soft ray longest, only a little longer than the spine. Adipose dorsal not much longer than deep, its base 2 to 4 that of the rayed dorsal, from which it is separated by a space equal to 2 to 24 times its base. Anal 11, 7 rays branched. Pectoral spine nearly as long as dorsal, strongly serrated on inner side. Caudal rather deeply notched, with rounded lobes, longest rays twice length of median. Caudal peduncle 14 to 1% times as long as deep. Olive-brown above, white beneath ; a few black dots on the sides. Total length 155 millim.
Upper Congo.—Type in Congo Museum, Tervueren.
1-2. Yg., types. Stanley Pool. M. P. Delhez (€.).
15. CHRYSICHTHYS DELHEZI.
Bouleng. Ann. Mus. Congo, Zool. i. p. 108, pl. xlii. fig. 2 (1899), and Poiss, Bass. Congo, p. 288 (1901), Chrysichthys delhezi.
Type (A. M.C.). #.
Depth of body 5 to 54 times in total length, length of head 3 times. Head much depressed, 14 times as long as broad, covered with thick skin above; occipital process narrow, extending to the small interneural. shield; snout broadly rounded, projecting very slightly beyond lower jaw, 13 (young) to 2 times as long as eye, which is 5 (young) to 6 times
336 SILURID&.
in length of head and 2 to 24 times in interocular width; width of mouth once and #in length of head; premaxillary band of teeth curved, 43 to 7 times as long as broad; vomero-pterygoid teeth forming a long and broad band, nearly continuous or narrowly interrupted in the middle, its width a little less than that of the premaxillary band in the adult; nasal barbel 13 to 1} diameters of eye; maxillary barbel } to # length of head; outer mandibular barbel nearly twice as long as inner, } to 2 length of head. Gill-rakers moderate, 10 on lower part of anterior arch. Dorsal I 6, slightly nearer end of snout than root of caudal; spine short, not serrated ; first and second soft rays longest, about 3 length of head. Base of adipose fin a little shorter than that of dorsal, from which it is separated by a space equal to 2 to 3 times its base. Anal 11, 7 rays branched. Pectoral 3 to 3 length of head; spine strongly serrated on inner border. Caudal rounded, very feebly emarginate in the adult, more deeply (median rays 2 length of outer) in the young. Caudal peduncle 13 to 14 times as long as deep. Dark brown above, white beneath.
Total length 270 millim.
Congo.—Type in Congo Museum, Tervueren.
Hous Upper Congo. Brussels University.
16. CHRYSICHTHYS MABUSI.
Bouleng. Ann. & Mag. N. H. (7) xvi. 1905, p. 645.
Depth of body 43% times in total length, length of head 34 times. Head strongly depressed, 14 times as long as broad, with feeble granular rugosities above; occipital process broad, in contact with interneural shield ; snout broadly rounded, twice as long as eye, which is 6 times in length of head and 24 times in interorbital width ; mouth inferior, its width 4 length of head; preemaxillary band of teeth curved, 6 times as long as broad ; vomerc-pterygoid teeth forming a long but narrow band, narrowly interrupted in the middle; nasal barbel nearly as long as eye ; maxillary barbel $ length of head; outer mandibular barbel 14 times as long as inner, ? length of head. Gill-rakers rather long, 16 on lower part of anterior arch. Dorsal I 6, equally distant from end of snout and from root of caudal; spine strong, serrated behind, 3 length of head ; second soft ray longest, a little shorter than head. Base of adipose fin 2 that of dorsal, from which it is separated by a space equal to 27 times its base. Anal 11, 7 rays branched. Pectoral spine 4 length of
CHRYSICHTHYS. dor head, very strongly serrated on inner border. Caudal deeply forked, with pointed lobes, outer rays about twice as long as middle rays. Fig.263.
fo) Chrysichthys mabusi.
Type. 4.4 Caudal peduncle 13 times as long as deep. Olive-brown above, white beneath.
Total length 250 millim.
Lake Bangwelu.
1. Type. L. Bangwelu. F. H. Melland, Esq., and Father Foulon (C.).
17. CHRYSICHTHYS ORNATUS.
Bouleng. Ann. Mus. Congo, ii. p. 39, pl. xi. fig. 2 (1902). Depth of body 4} to 5 times in total length, length of head 3 to 34 times. Head much depressed, 1} to 1+ times as long as broad, finely granular on the vertex and occiput, striated on the snout; occipital process broad, in contact with interneural shield ; snout broadly rounded, nearly twice as broad as long, not extending beyond lower jaw, its length 2 or a little more than 4 that of head; eye 4 to 54 times in length of head, 12 to 2} times in interorbital width ; width of mouth 13 to 1? times in length of head; premaxillary band of teeth curved, 6 to 8 times as long as broad; vomero-pterygoid teeth forming a broad band VOL, Il. Z
398 SILURIDA.
narrowly interrupted in the middle; nasal barbel + to $ length of head ; maxillary barbel as long as or a little longer than head, sometimes terminating in a small warty club-shaped expansion; outer mandibular barbel 3 to ? length of head, inner $ to 2. Gill-rakers moderate, 9 or 10 on lower part of anterior arch. Dorsal I 6, equally distant from root of caudal and from end of snout or a little nearer the latter; spine not serrated, 3 length of head; first soft ray longest, shorter than head. Adipose dorsal 2 or 3 times as long as deep, nearly as long as rayed dorsal, from which it is separated by a space equal to twice its base. Anal 11-13, 6-8 rays branched. Pectoral spine as long as dorsal, finely denticulate on outer border, strongly serrated on inner. Caudal COhrysichthys ornatus.
Type (A. M.C.). §.
deeply forked, with pointed lobes, longest rays 2 to 2} times length of median. Caudal peduncle a little longer than deep. Brown above, speckled with blackish and with broad blackish bands; one of these extends from‘the operculum to the base of the dorsal, forming a crescent on the nape; another on each side of the body sending off an upper branch to the adipose fin; a narrow interorbital cross-band ; fins spotted with blackish ; a blackish band on each lobe of the caudal ; lower parts white.
Total length 190 millim.
Upper Congo and Ubanghi.
1-3. Types. Monsembe, Upp. Congo. Rey. J. H. Weeks (P.).
CHRYSICHTHYS. 339 18. CHRYSICHTHYS MYRIODON.
Bouleng. Ann. Mus. Congo, Zool. i. p. 139, pl. li. (1900), Poiss. Bass. Congo, p- 284 (1901), and Tr. Zool. Soe. xvi. 1901, p. 147. Depth of body 45 to 5 times in total length, length of head 34 to 34 times. Head much depressed, 1§ to 14 times as long as broad, rough on vertex and occiput; occipital process in contact with interneural shield ; snout broadly rounded, scarcely projecting beyond lower jaw, 3 length of head; eye 34 (young) to 6 times in length of head, 14 (young) to 23 times in interocular width ; width of mouth 14 to 2 times in length of head ; preemaxillary band of teeth nearly straight, 6 to 7 times as long Mo ORE Fig.265.
Ohrysichthys myriodoi.
Type (A. M.C.). .
as broad ; vomero-pterygoid teeth very fine and closely set, forming a long and broad uninterrupted band in the adult (narrower and slightly interrupted in the middle in the young), strongly widening posteriorly ; nasal barbel ? to + diameter of eye; maxillary barbel § to } length of head ; inner mandibular barbel 4 length of head, outer a little less than 3. Gill-rakers 12 (young) to 20 on lower part of anterior arch. Dorsal I 6, once and } as distant from root of caudal as from end of snout; spine nearly $ length of head, rugose, not serrated; first and second soft rays longest, about % length of head. Adipose fin longer than deep, its base 3 that of the dorsal and 4 to } its distance from the latter. Anal 12-14, 8-10 rays branched. Pectoral spine a little longer and stronger than dorsal, strongly serrated on inner side, Caudal Ze
340 SILURID-E.
deeply notched, with obtusely pointed lobes, longest rays twice length of median. Caudal peduncle 1} to 2 times as long as deep. Olive-brown above, white beneath; young with a blackish spot at the end of the dorsal, and another on each lobe of the caudal. Total length 470 millim.
Lake Tanganyika.—Type in Congo Museum, Tervueren. 1. Ad., type. Tembwi. Prof. J. B.S. Moore (C.). 2. Skel. Kinyamkolo. i BG WR Kibwest. =] 19. CHRYSICHTHYS BRACHYNEMA.
Bouleng. Ann. & Mag. N. H. (7) vi. 1900, p. 480, Poiss. Bass. Congo, p. 286 (1901), and Tr. Zool. Soe. xvi. 1901, p. 148, pl. xv. Depth of body 4 to 5 times in total length, length of head 33 to 32 times. Head much depressed, 1§ or 1+ times as long as broad, covered Fig.266.
Chrysichthys brachynema, Type (Tr. Z. 8.1901). 4.
with thick skin above; occipital process hidden under the skin, but reaching interneural shield; snout much flattened, about twice as broad as long, broadly rounded, projecting a little beyond lower jaw, its length + that of head; eye 5 to 6 times in length of head, 2 to 2} times in interocular width; width of mouth 13 to 2 times in length of head;