164 
THE TANGANYIKA TROBLEM. 
deep water, may, I think, be referred to this species. The depth of the body is 
5 or 6 times in the total length ; head, i or J longer than broad ; diameter of the eye, 
3.4 to 3-4 t' n ies in the length of the head, 1 \ to 1 J in the interocular width ; maxillary 
barbel, § to j the length of the head ; vomero-pterygoid teeth forming a narrow 
subcrescentic band, slightly interrupted mesially. Base of adipose dorsal, .4 or J 
its distance from the rayed dorsal ; anal IV. 8-10; 7 to 9 very large retrorse serra* 
on the inner side of the pectoral spine. A blackish spot at the end of the dorsal, 
and another on each lobe of the caudal. 
18. Chrysichthys brachynema. — Klgr. 1900. (Fig., p. 169.) 
Depth of body, 4 to 5 times in total length ; length of head, 3.} to 3.4 times. 
Head broad and much depressed, | or J longer than broad, covered with thick 
smooth skin ; snout much flattened, twice as broad as long, broadly rounded, pro- 
jecting a little beyond the lower jaw, its length 4 that of the head ; diameter of the 
eye, l4 to twice in the length of the snout, 5 or 6 times in the length of the head, 
and 2 or 2} in the interocular width ; occipital process hidden under the skin, but 
reaching the interneural shield ; nasal barbel as long as or slightly longer than the 
diameter of the eye in the young, § the diameter of the eye in the adult ; maxillary 
barbel, 4 or 4 the length of the head ; outer mandibular barbel, 4 or 4 the length of 
the head ; inner, 4 or 4. Vomero-pterygoid teeth forming a broad crescentic or 
horseshoe-shaped band, uninterrupted or narrowly interrupted mesially ; this band 
as broad as the preemaxillary band in the adult, also widening behind, narrower 
and more tapering behind in the young. Dorsal I. 6, spine very feebly serrated in 
front and behind, covered with a thick skin, its length § that of the head and a little 
shorter than the soft rays. Adipose dorsal, 1.4 to twice as long as deep, its base 
hardly equal to that of the rayed dorsal and .4 or 4 its distance from the latter. Anal 
IV. 8-9. Pectoral spine thicker and longer than that of the dorsal, armed on its 
inner side with strong retrorse serne. Ventral not reaching the anal. Caudal 
deeply notched, with obtusely pointed lobes, the longest rays twice to twice and a 
half as long as the middle ones. Caudal peduncle i4 to ijj as long as deep. Olive 
above, white beneath. 
Total length, 400 millim. 
Described from several specimens from Kalambo and Usambura. 
This species is also closely allied to C. cranchii , but may be distinguished from it 
by the absence of rugosities on the skull, the shorter head, and the shorter 
mandibular barbels. 
19. Auchenoglanis biscutatus. — Geoffr. 1829. 
Obtained at Kalambo ; also far out, in deep water. 
20. Anolopterus Platychir. — Gthr. 1864. , 
Described from two specimens from marshes near Mbity. 
The occurrence of this species in Nyassa has recently been recorded, and it has 
also been described by Vaillant as Chimarrhoglanis leroyi from Mrogoro torrent, 
Urugaru Mountains, East Africa. 
