PLATYT^NIODUS.— HEMICHEOMIS. 427 



to below anterior border of eye, its width ^ that of head ; lips thick ; 

 4 series of scales on the cheek. Gill-rakers short, 9 on lower part of 

 anterior arch. Dorsal XV-XVI 10 ; spines increasing in length to the 

 last, which measures f to ^ length of head ; longest soft rays ^ to f 

 length of head. Anal III 9-10 ; third spine f- to not quite % length 

 of head. Pectoral as long as head, extending to above origin of anal. 

 Ventral reaching beyond origin of anal. Caudal truncate. Caudal 

 peduncle 1-j times as long as deep. Scales feebly denticulate, 

 33-35 -j^jy : lateral lines j^g. Pale olive above, silvery white beneath, 

 with or without six or seven ill-defined darker cross-bars ; a blackish 

 opercular spot ; a dark grey or blackish band from this spot to the root 

 of the caudal fin ; a rather indistinct dark vertical bar below the eye ; 

 dorsal and caudal fins greyish ; ventral fins yellow, or with the outer 

 rays blackish ; anal yellow, with or without three orange ocellar spots, 

 encircled with red, on the posterior part. 



Total length 140 millim. 



Lake Victoria. 



1. Type. Bunjako. Mr. E. Degen (C). 



2. Ad. Sesse Is. Dr. E. Bayon (C.) ; 



Genoa Museum (P.). 



15. HEMICHROMIS. 



Peters, Mon. Berl. Ac. 1857, p. 403 ; Giinth. Cat. Fish. iv. p. 274, part. (1862) ; 

 Bouleng. Proc. Zool. Soc. 1898, p. 134, and Poiss. Bass. Congo, p. 409 

 (1901) ; Pellegr. Mem. Soc. Zool. France, xvi. 1904, p. 252 ; Bouleng. 

 Fish. Nile, p. 461 (1907). 



ChromicMhys, Guichen. in A. Dum. Arch. Mus. x. 1859, p. 257. 



Body short or moderately elongate ; scales cycloid or very feebly 

 denticulate ; two incomplete lateral lines. Teeth conical, in one 

 series, or with one, very rarely two, series of a few very small teeth 

 behind the outer ; the two median teeth of the outer series usually 

 larger than the others. Maxillary bone narrow and curved behind, 

 concealed when the mouth is closed. Dorsal with 13 to 15 spines, 

 anal with 3. Occipital and parietal crests strong, extending to between 

 the orbits; prsemaxillary processes extending to between the orbits. 

 Vertebrae 26-28 *. 



Africa. 



* 15-fl3 in //. fasciatps, 14 + 12 in //. bimaculatus. 



