3yU OSTEOGLOSSID-E. 



organ (branchial helix, Iltjrtl). Air-bludder 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. 



Sudis aclansouii, Cuv. lict/nc Aiu'di. 



niloticus, i^Ehreiib.) Cuv. lici/jie Aiiiin. ; liiipp, Bcschrcib. Neu. 



Kil-thche, 1H29, p. 10, taf. '6. tig. 2. 

 Heterotis niloticus, Ehrcnhenj. 



eliKiubergii, (Juv. »!)• Vid. xix. p. 4G9, pis. 583 & 584. 



adausoni, (Jut. l^ \'al. xix. p. 478. 



Anatomy : Ilyrtl, Dciikachr. Ak. IViss, Wien, viii. 1855, pp. IG, Avitk 



3 plates. 



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



Vert. ?tf. 



42 



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

 total (witliout caudal). Anal fin commencing somewhat in advance 

 of the dorsal. 



Kilo ; West Africa. 



a. Twenty-two inches long. Nile. 



h-d. Half-grown. White Nile (lat. 9° N.). From Mr. rethcrick's 



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



illustrating that IscJinoso^na of Spix and Valenciennes was 



founded on a similarly deformed example. 

 c. Half-grown. West Africa. Purchased of Mr. Dalton. 

 /'-/(. Skins : from IG to 35 inches long. West Africa, Purchased 



of Mr. Dalton. 

 1. Adult : skeleton. Chartoum. Prom Mr. Petherick's Collection. 



