SAKCODACES. — IITDEOCTON. ^ 179 



19. Skel. Sette Cama, Gaboon. 



20. Ad. Gaboon. R. B. N. Walker, Esq. (P.). 

 21,22. Hgr.&yg. 



23-25. Ad. &hgr. Ibali, L. Leopold 11., Upper M. P. Delhez (C). 



Congo. 



26-27. Hgr. Bolobo, Upper Congo. Rev. G. Grenfell (P.). 



28. Ad. Monsembe, „ Rev. J. H. Weeks (C). 



29. Ad. Stanley Falls. Rev. W. H. Bentley (C). 



30. Yg. Banzyville, Ubanglii. Capt. Royaux (C.). 

 31-32. Ad. Kafue R., Upper Zambesi. T. Codrington, Esq. (P.). 

 33. Ad., skin. Botolette R., nr. L. Ngami. R. Ward, Esq. (P.). 



2. HYDROCYON. 



ITi/drocinvs, part., Cuv. Regne Anim. ii. p. 167 (1817). 



Hydrocijon, Cuv. Mem. Mus. Paris, v. 1819, p. 353 ; Cuv. & Val. Hisf. Poiss. 



xxii. p. 309 (1849) ; Giintli. Caf. Fish. v. p. 350 (186-1) ; Bouleng. Poiss. 



Bass. Congo, p. 140 (1901), and Fish. Nile, p. 98 (1907). 



Snout rather elongate ; mouth large, with very strong, pointed, more 

 or less compressed, sharp-edged teeth, wide apart and forming a single 

 series; praemaxillary bones slightly movable vertically; maxillary 

 toothless, moderately large, and slipping under the praeorbital. Cheek 

 covered by the large suborbitals ; nostrils near the eye, close together, 

 separated by a valvular flap ; gill-membranes free from the isthmus ; 

 4 branchiostegal rays. Body elongate, compressed ; belly rounded. 

 Scales moderately large, not ciliated ; lateral line nearer the ventral 

 than the dorsal outline; a scaly process at the base of the ventral fin. 

 Dorsal fin with 10 or 11 rays, above the ventrals ; anal with 13 to 

 18 rays ; a small adipose dorsal fin. 



Part of the eye, in front and behind, covered by an adipose lid. 

 Tubules of lateral line straight and short ; most of them emit a short 

 spur, directed downwards, or a few scales here and there having the 

 spur directed upwards. Fins more or less falcate; ventral rays 10. 

 Vertebrae 49-52 (31-34 + 17-18). 



Nile and Tropical Africa. 



Synopsis of the Species. 

 I. 2 series ot" scales between lateral line and scaly process at base o£ ventral. 



>r\ Qi 



Sc. 48-54 ^^ ; dorsal originating in advance of 

 ventral; depth of body 4-5i times in total 

 length l,ILforshdn,Q\\y.,^,nO. 



n2 



