ISO CHAKACINID^. 



Sc. 44-48 jf-pg ; dorsal originating above or 



slightly in advance of ventral ; depth of body 



3£-4i times in total length 2. II. lineatus, Blkr., p. 182. 



Sc. 56-57 ^f ; dorsal not originating in advance of 



ventral ; depth of body 4-4J times in . total 



length 3 . H. mttiger, Elgr., p. 184. 



II. 3 series of scales between lateral line and scaly process at base of ventral ; 

 dorsal not originating in advance of ventral. 



Sc. 54-58 a 6 i 2 ; depth of body 3§-4| times in 



total length ; eye 5^ times in length of head 



in adult 1. II. goliath, Blgr., p. 184. 



Sc. 47-54 -"gr^ ; depth of body 3J-4^ times in total 



length ; eye 7^ times in length of head in 



adult 5. II. brevis, Gthr., p. 18C. 



1. HYDROCYON FORSKALIL 



Salmo dentex (non Hasselq.), Forskal, Descr. Anim. pp. xiii & 6G (1775). 

 Characinus dentex, Geoffr. Descr. Egypte, Poiss. p. 49, pi. iv. fig. 1 (1809). 

 Ilydrocyon forskdlii, Cuv. Mem. Mus. v. 1819, p. 354, pi. xxviii. fig. 1 ; Mull. & 



Trosch. Horee Ichthyol. i. p. 11, pi. iii. fig. 6 (1845) ; Giinth. Cat. Fish. v. 



p. 351 (1864), and Petherick's Trav. ii. p. 244 (1869) ; Steind. Sitzb. Ak. 



Wien, lxi. i. 1870, p. 547; Vincig. Ann. Mns. Genova, xxxvii. 1896, p. 29, 



and xxxix. 1898, p. 258 ; Bonleng. Fish. Nile, p. 100, pi. xvi. fig. 1 & pi. xvii. 



fig. 1 (1907). 

 Ilydrocyon dentex, Rtipp. Beschr. n. Fische Nil, p. 5 (1829). 

 Ilydrocyon forskdlii, part., Cuv. & Val. Hist. Poiss. xxii. p. 309 (1849) ; Peters, 



Reise Mossamb. iv. p. 69 (1868). 



Depth of body 4 to 5^ times in total length, length of head 4 to 5 

 times. Head 2 to 2| times as long as broad ; snout \ to \ length 

 of head ; diameter of eye 4 (young) to 6^ times in length of head, 

 interorbital width 3 to 4 times ; mouth extending to below nostrils, 

 maxillary bone to below anterior border or centre of eye; 5 or (i 

 large teeth in upper jaw and 4 or 5 in lower ; suborbital and opercular 

 bones smooth or feebly striated. Gill-rakers much shorter than gill- 

 hlamenis, 8 to 10 on lower part of anterior arch. Dorsal II 8, equally 

 distant from end of snout, nostrils, or eye, and from root of caudal, 

 originating in front of ventral ; second simple ray longest, -f to \\ times 

 length of head. Anal HI 11-13, third simple ray longest, \ to f length 

 of head. Pectoral fin about f length of head. Ventral as long as or 

 shorter than pectoral, below middle of dorsal. Caudal deeply forked, 

 with long, pointed lobes. Caudal peduncle If to 2 times as long as 

 deep. Scales 48-54 £f?f, 3 between lateral line and ventral, 2 between 



