PETROCEPHALUS.— ISICHTHTS. ^ 59 



oiii^jinatiiig above first ray of anal, its length twice and 3 in its distance 

 from head. Anal 27, equally distant from base of ventral and from base 

 of caudal. Pectoral pointed, about f length of head, twice as long as 

 ventral, and extending beyond vertical of base of latter. Caudal fin with 

 pointed lobes. Cauchil peduncle twice and l as long as deep, f length 

 of head. 41 scales in lateral line, y7> in transverse series on body, .j in 

 transverse series between dorsal and anal, 12 round caudal peduncle. 

 Silvery; back dark grey; fins grey. 



Total length 88 millim. 



Ijake Victoria. 

 1. Type. Mouth of Katonga 1\. Mr. E. Degen (C). 



:i ISICHTHYS. 



Gill, Proc. Ac. PlalaJ. 18(;2, p. 444 (18G3) ; Boideiig. Proc. Zool. Soc. 1898, 



p. 791. 

 Mormyrops, part., Giiiitli. Cat. Fish. vi. j). 2'1?) (ISGG). 



Teeth rather large, notched, few, 5-6 in the upper jaw, 6 in the 

 lo^^er; minute conical teeth on the parasphenoid and on the tongue ; 

 mouth subinferior, below the level of the eye. Nostrils widely separated. 

 Body much elongate ; vcntrals much nearer anal than pectorals. Dorsal 

 a little longer than anal. A^Mtebrie 04 (2G + 3;). 



West Africa. 



1. ISICHTHYS HENRYI. 



Gill, Proc. Ac. Philad. 1862, p. 444 ; Bouleng. Proc. Zool. Soc. 1898, p. 791 ; 



Pappenh. Mitth. Zool. Mus. Berl. iii. 1907, p. 347. 

 Moryni/rops henri/i, Giinth. (Jat. Fish. vi. p. 224 (18G6) ; Ilubreclit, Notes Leyd. 



31 us. iii. 1S8], p. 70. 

 Mormijrns henryi^ Giinth. Ann. & Mag. N. H. (3) xx. 18G7, p. 115 ; Stcind. Notes 



Leyd. Mus. xvi. 1894, p. Qii^. 

 Aformt/rvs cohififormls, Peters, Sitzb. Ges. nat. Fr. Berl. 1882, p. 72. 

 Mormijriis (Isisfius) henriji, Sauvage, Bull. Soc. Zool. France, 1884, p. 207, pi. vi. 



fig. 1. 



Depth of body 8 to 11 times in total length, length of head 6 to 7^ times. 

 Head 1^ to 2 times as long as deep ; snout rounded, \ to \ length of head ; 

 mouth subinferior, its width \ length of head ; nostrils midway between 

 eye and end of snout ; eye small, hardly \ length of snout, -g- inter- 

 orbital width. Dorsal 39-50, longer than its distance from head. Anal 

 38-47, originating a little posterior to origin of dorsal. Pectoral about 



