1. MORMYRUS. 221 



from the Nile ; still it is possible that the Mossambique fish may- 

 prove to be different wheii their characters are better known. 



The ribs of this species show the peculiarity of being perforated 

 by many holes along the middle of their upper half. 



16. Mormyrus bovei. 

 Mormyrus bovei^ Cuv. Sf Val. xix. p. 283. 



D. 20-23. A. 31-33. 



Form of the snout as in M. bane, the cleft of the mouth being 

 below the middle of the orbit. The height of the body is nearly one- 

 fourth of the total length (the caudal fin included). (Val.) 



NUe. 



17. Mormyrus isidori. 



Mormyrus isidori, Ctiv. ^ Val. xix. p. 285. 



Petrocephalus isidori, Marciisen, Mormyr. p. 150, pi. 5. fig. 20 (not 

 good). 



D. 19-20. A. 24. L. lat. 55. Vert. 39. 



Snout obtuse, rounded, compressed, short, but longer than the eye, 

 which is rather small ; cleft of the mouth at the lower side of the 

 snout, below the front margin of the orbit. Teeth small, dilated, 

 and notched, forming an arched series round the mai-gin of both 

 j;iws. Pectoral extending to, or somewhat beyond, the middle of the 

 ventral, which is not quite half as long as the pectoral. The height 

 of the body is contained from twice and three-fourths to three times 

 and one-third in the total length (without caudal), the length of the 

 head four times and one-half. 



Nile. 



a-h. From 3 to 4 inches long. From Dr. E. Riippell's Collection. 



18. Mormyrus adspersus. 

 D. 19-21. A. 27. V. 6. L. lat. 50. 



Snout compressed, short, elevated, subtruncated in front, the cleft 

 of the mouth being at its lower side but before the vertical from 

 the front margin of the eye. Eye small, as long as the snout. 

 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 

 extends beyond the extremity of the ventral, which is very small, 

 only half as long as the head. The height of the body is contained 

 thrice in the total length (without caudal), the length of the head 

 four times and one-third. Light brownish, dotted all over with 

 brown, the dots being largest and most numerous On the head, thorax, 

 and on the vertical fins. 



West Africa. 



a. Three inches long. Purchased of Mr. Damon. 

 h. Three inches long. Purchased of Mr. Stevens. 



