362 characinidjE. 



little more than one-third of the length of the head. The lower jaw 

 with about sixteen teeth ; the posterior series of the upper jaw is 

 immediately behind the anterior. The fifth infraorbital bone much 

 smaller than the sixth. Body uniformly coloured (in a dried state) ; 

 dorsal with numerous blackish spots. 



Mozambique. 

 a-b. Adult: skins. Kiver Shire. Presented by Ch. Livingstone, 

 Esq., and Dr. Kirk. 



6. Distichodus mossambicus. 



Peters, Monatsber. Akad. Wiss. Berl. 1852, p. 275. 



D. 26-27. A. 15-16. V. 12. L. lat. 68. 

 The length of the head is one-fifth of the total (with the caudal). 

 The fifth and sixth infraorbital bones are equal in extent. The outer 

 series of incisors is composed of eighteen teeth. Snout subcylin- 

 drical. Body with dark cross-bands ; fins blackish. {Pet.) 

 Mozambique. 



^. Only one series of teeth in the jaws. 



7. Distichodus macrolepis. 



D. 26. A. 14. L. lat. 67. L. transv. 14/12. 



The height of the body is one-third of the total length (without 

 caudal), the length of the head rather more than one-foiirth. The 

 upper jaw does not project much beyond the lower ; interorbital 

 space convex, its width being one-third of the length of the head. 

 The lower jaw with about sixteen teeth ; there is only one series of 

 teeth in each jaw. Coloration uniform (in a dried state). 



Eastern Africa. 

 a. Skin, 14 inches long. River Shire, near the island of Dakana- 

 mois. Presented by Dr. Kirk. 



Eighth Group. ICHTHYBORINA. 



Characlnidx with an adipose fin and with the dorsal rays in- 

 creased in number, with the gill-membranes free from the isthmus, 

 with the belly rounded, and with canine teeth. 



Africa. 



42. ICHTHYBORUS. 



Dorsal fin somewhat behind the middle of the length of the body, 

 with foui'teen or seventeen rays ; anal of moderate length ; ventraJs 

 a little in advance of the dorsal; caudal scaly, forked. Body com- 

 pressed, elongate, covered with small scales ; lateral line complete. 

 Cheeks naked. Cleft of the mouth wide : the intermaxUlaries of 

 both sides coalesce, forming a very moveable flattish bone, which is 

 armed with a pair of canine teeth anteriorly, and with a scries of 



I 



