222 MORMYRID^. 



19. Monnyrus catostoma. 

 D. 21. A. 26. L. lat. 41. 



The form of the snout is nearly the same as in M. isidori, the cleft 

 of the mouth being at the lower side of the snout, behind the front 

 margin of the orbit. Teeth small, dilated and notched, forming a 

 complete series round the margin of both jaws. The origin of the 

 dorsal fin is a little nearer to the root of the caudal than to the 

 occiput. The pectoral exrtends somewhat beyond the middle of the 

 ventral, which is rather more than half as long as the pectoral. The 

 height of the body is contained thrice in the total length, the length 

 of the head thrice and two-thirds. Uniform silvery, back blacldsh. 



Rovuma River. 

 a-c. Two inches long. Presented by Ch. Livingstone, Esq. 

 d-e. Two inches long. Presented by Dr. Kirk. 



2. HYPEROPISUS. 



Hyperopisus, GUI, Proc. Acad. Nat. Sc. Philacl. 1862, p. 443. 

 Dorsal fin much shorter than anal. A large broad patch of obtuse, 

 molar-like teeth on the roof and bottom of the mouth. 



1. Hjrperopisus dorsalis. 



Kashoue, Sonnini, Voy. Eg. pi. 21. fig. 3. 

 Monnyrus bebe, Lacep. v. pp. 019, 622. 



dorsalis, Geof. Descr. Eg. Poiss. i. p. 276, pi. 8. figS. 1-2 ; Cuv. 



Sf Val; xix. p. 271. 

 Phagi-us dorsalis, Marcusen, Morrmjr. p. 142. 



D. 13-16. A. 56-62. V.6. L.lat. ca. 110. Vert. 22/37 

 (55, Marcusen). 

 Snout obtuse, rather short, rounded, with the jaws equal anteriorly, 

 and without labial appendage. Eye small, situated far before the 

 middle of the length of the head. Teeth not very small, fixed, di- 

 lated, notched. Pectoral extending beyond the root of the ventral, 

 which is short but more than half as long as the pectoral. The 

 height of the body is contained from three times and three -fourths 

 to five times in the total length (without caudal), the length of the 

 head five times and one-half. The distance of the origin of the 

 dorsal fin from the root of the caudal is one-half of its distance from 

 the gill-opening. 



Nile. 

 a-h. Adult and young. Chartoum. From Consul Petherick's Col- 

 lection, 

 c, d-f. Adult and half-grown. Lower Nile, 



g. Adult male: skeleton. Chartoum. From Consul Petherick's 

 Collection. 



