1. MOBMYKUS. 215 



The species may be referred to the following divisions : — 



I. Dorsal fin occup^dng the greater portion of the length of the back ; anal 



short, p. 215. 



II. Dorsal and anal fins subequal and moderate in length ; snout long and 



deem'ved, p. 217. 



m. Dorsal and anal fins subequal and moderate in length ; cleft of the 

 mouth terminal or directed upwards ; snout short, p. 218. 



IV. Snout short, obtuse, with the cleft of the mouth at its lower side, 

 p. 220. 



I. Dorsal Jin occitpying the greater portion of the length of the back ; 

 anal short. 



1. Mormyrus caschive. 



Mormyrus caschive, HasseJq. It. Palad. p. 398 ; Cuv. ^ Val. xix. p. 227 ; 



Marcusen, Mormyr. p. 120*. 

 longipinuis, liupp. Forfsets. Beschreib. neuer Fisch, Nil, p. 7, 



pi. 1. fig. 2. 



D. 81-87. A. 18-20. V. 6. Vert. 1^. 



Scales very small. Snout conical, much produced, slightly bent 

 downwards, the pupil of the eye being exactly in the middle of the 

 length of the head. Lower lip somewhat projecting beyond the 

 upper. Teeth very small, slightly dilated, the crown with a shallow 

 notch. The height of the body is nearly equal to the length of the 

 head, which is two-ninths of the total (without caudal). 



NHe. 



a-h. Fine specimens, 23 inches long. Chartoum. From Consul 



Petherick's Collection. 

 c-f. Young. Lower Nile. From Dr. Riippell's Collection. 



Mormyrus rume, Cuv. & Val. xix. p. 247, pi. 569, is scarcely dis- 

 tinct from M. caschive ; it is said to have the scales somewhat larger, 

 about 112 along the lateral lime. — Senegal. 



2. Mormyrus mucupe. 



Mormyrus mucupe, Peters, Monatsher. Acad, Wiss. Berl. 1852, p. 275. 

 D. 71. A. 18. 

 Snout slender, decurved, with the lower jaw prominent. (Peters.) 

 Mossambique. 



3. Mormyrus oxyrhynchus, 



Monnyrus kannume, Forsk, Descript. Anim. p. 74 T_,acep. v. p. 619 ; 

 Marcusen, Moi'myr. p. 114. 



* To show the variabUitj of the fin-rays within the limits of a species, Dr. 

 Marcusen has selected the instance of Chromis niloticus and Tilapia. But it is 

 now perfectly well known that Africa is inhabited by a considerable number of 

 Chromides ; and nobody who has studied these fish, will doubt that Tilapia is a 

 Tery distinct species from Chr. niloticus. 



