1 64 THE TANGANYIKA PROBLEM. 



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, \ or \ longer than broad ; diameter of the eye, 

 3f to 3i times in the length of the head, i{ to ij in the interocular width ; maxillary 

 barbel, § to \ the length of the head ; vomero-pterygoid teeth forming a narrow 

 subcrescentic band, slightly interrupted mesially. Base of adipose dorsal, h or \ 

 its distance from the rayed dorsal ; anal IV. 8-io ; 7 to 9 very large retrorse serne 

 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. — Blgr. 1900. (Fig., p. 169.) 



Depth of body, 4 to 5 times in total length ; length of head, 3! to 3^ times. 

 Head broad and much depressed, } or } 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 \ that of the head ; diameter of the 

 eye, 1^ to twice in the length of the snout, 5 or 6 times in the length of the head, 

 and 2 or z\ 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, ^ or \ the length of the head ; outer mandibular barbel, h or \ the length of 

 the head ; inner, \ or \. Vomero-pterygoid teeth forming a broad crescentic or 

 horseshoe -shaped band, uninterrupted or narrowly interrupted mesially ; this band 

 as broad as the pmemaxillary 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, \h to twice as long as deep, its base 

 hardly equal to that of the rayed dorsal and \ or ^ 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 serrse. 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 \\ to \\ 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. 



