380 OSTKOGLOSSIDJi. 



organ (branchial helix, Hi/rtl). Air-bladder cellular. Stomach 

 divided into a membranaceous and muscular portion ; two long py- 

 loric appendages ; intestinal tract with an upper and lower bend. 

 Tropical Africa. 



1. Heterotis niloticus. 



Siidis adansonii, Cuv. Jtq/ne Anim. 



niloticus, {Ehrenb.) Cuv. Riyne Anim. ; Riijip. Bcschreih. Neu. 



Nil-H>ichc, 1829, p. 10, taf. 3. fig. 2. 

 Heterotis niloticus, Hhrenberg. 



ebrenbergii, Cuv. ^- Vul. xix. p. 469, pis. 683 & 684, 



adausoni, Cuv. ^- Val. xix. p. 478. 



Anatomy : Hyrtl, Denkschr. Ak. Wiss. Wien, viii. 1865, pp. 16, with 



3 plates. 



B. 8. D. 33-34. A. 35-36. V. 6. L. lat. 35-3G. L. trausv. 4|/5. 

 Vert. ?^. 



The length of the head is a little more than one-fourth of the 

 total (without caudal). Anal fin commencing somewhat in advance 

 of the dorsal. 



Kile ; West Africa. 

 a. Twenty-two inches long. Nile. 



h-cl. Half-grown. White Nile (lat. 9° N.). Erom Mr. Petherick's 



Collection, — One of these specimens has the vertical fins united, 



iHustratiug that Ischnosovia of Spix and Valenciennes was 



founded on a similarly deformed example. 



e. Half-grown. West Africa. Pui'chased of Mr. Dalton. 



f-h. Sldns : from 16 to 35 inches long. West Africa. Purchased 



of Mr. Dalton. 

 i. Adult : skeleton. Chartoum. From Mr. Petherick's Collection. 



