180 CHAEACINIDJ^. 



Sc. 44-48 3^t; dorsal originating above or 



42-O2 



slightly in advance of ventral ; depth of bod}^ 



3A-41 times in total length 2. II. lineatus, Blkr., p. 182. 



Sc. 56-57 ^ ; dorsal not ongmatmg m advance of 

 ventral ; depth of body 4-41 times in total 



leno-th 3- //. vittiger, Blgr., 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 — ri^ ; depth of body 3f-4^ times in 

 "2 

 total length ; eye 5^ times in length of head 



in adult ^-11' golialli, Blgr., p. 184. 



Sc. 47-54 %l^ ; depth of body 3.^-4^ times in total 

 length ; eye 1\ times in length of head in 

 r^(\x\\t h. II. brecis, Gthr., p. 18G. 



1. HYDROCYON FORSKALII. 

 Salmo dentex (non Hasselq.), Forskfd, Descr. Anim. pp. xiii & GO (1775). 

 Characinus dentex, Geoffr. Descr. Egypte, Poiss. p. 40, pi. iv. fig. 1 (1800). 

 Ilijdrocyon forskalii, Cuv. Mem. Mus. v. 1810, p. 354, pi. xxviii. fig. 1 ; Mull. & 



Trosch. Horse Ich thy ol. i. p. 11, l»l. iii. fig. G (1845); Gunth. Cat. Fish. v. 



p. 351 (18G4), and Petherick's Trav. ii. p. 244 (18G0) ; Steind. Sitzb. Ak. 



Wien, Ixi. i. 1870, p. 547; Vincig. Ann. Mus. Geneva, xxxvii. 189G, p. 20, 



and xxxix. 1808, p. 258 ; Bouleng. Fish. Nile, p. 100, pi. xvi. fig. 1 & pi. xvii. 



fig. 1 (1007). 

 Hydrocyon dentex, lliipp. Beschr. n. Fische Nil, p. 5 (1820). 

 Ilydrocyon forskaUi, part., Cuv. & Val. Hist. Poiss. xxii. p. 300 (1840); Peters, 



Reise Mossamb. iv. p. GO (18G8). 

 Depth of body 4 to 5 J 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 6J times in length of head, 

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

 maxillary bone to below anterior border or centre of eye; 5 or 6 

 lar<'-e teeth in upper jaw and 4 or 5 in lower ; suborbital and opercular 

 b(mes smooth or feebly striated. (aill-rakers much shorter than gill- 

 filaments, 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, 

 orif^inating in front of ventral ; second simple ray longest, J to 1 J times 

 length of head. Anal III 11-13, third simple ray longest, i to J 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 ^t-^t 3 between lateral line and ventral, 2 between 



