SARCODACES.— HYDROCYOX. 179 



19. Skel. Sette Cama, Gal)oon. 



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

 21,22. Hgr.&yg. 



23-25. Ad. & hgr. Ibali, L. Leopold II., 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, Ubanghi. 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. 



Hijdrociiuis, part., Cuv. Regne Anim. ii. p. 167 (1817). 



Hydrocyon, Cuv. Mem. Mus. Paris, v. 1819, p. 353 ; Cuv. & Val. Hist. Poiss. 



xxii. p. 309 (1849) ; Giinth. Cat. Fish. v. p. 350 (1864) ; 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. 

 Vertebra; 49-52 (31-34 + 17-18). 



Nile and Tropical Africa. 



Synopsis of the Species. 

 I. 2 series of scales between lateral line and scaly process at base of ventral. 

 Sc. 48-54 Tj-sf ; dorsal originating in advance of 

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

 length 1. H. forshalii, Cuv., p. 180. 



