THE TANGANYIKA PROBLEM. 



179 



eye, the diameter of which is double the interocular width, and is contained 3 to 3i 

 times in length of head ; lower jaw projecting beyond the upper ; maxillary extend- 

 ing to below anterior fourth of eye ; teeth small in two rows ; 2 or 3 series of 

 scales on the cheek ; large scales on the opercle. Gill-rakers moderately long, 15 

 on lower part of anterior arch. Dorsal XVI. -XVII. 10 ; spines increasing in length 

 to the last, which measures § or h length of head ; longest soft rays \ or f length of 

 head. Pectoral pointed, a little shorter than head. Ventral reaching vent. Anal 



Trematocara marginatum. See p. 192. 



III. 7-8 ; third spine longest, a little shorter than last dorsal spine. Caudal feebly 

 emarginate. Caudal peduncle \h times as long as deep. Scales with finely den- 



25—29 



ticulate border, 37-40, 



lat. 1, 



Pale brownish above, silvery 



9—10- ' 13—17 



beneath ; a blackish opercular spot ; dorsal and anal edged with black ; 4 or 5 black 

 liars across the caudal ; young with black bars across the dorsal. 



Total length, 1 10 millim. 



Described from several specimens from Kalambo. 



Ectodus descampsi. See p. 186. 



43. Paratilapia macrops. — Blgr. 1898. (Fig., p. 185.) 



Teeth small, in 3 series in each jaw, forming a narrow band, outer largest. 

 Depth of body three times in total length ; length of head, 2| to 3. Snout with 

 straight upper profile, a little shorter than the eye, the diameter of which is i\ 

 times in length of head and exceeds interorbital width ; maxillary extending to 

 below anterior border of eye ; 2 or 3 series of scales on the cheek ; large scales on 

 the opercle. Gill-rakers short, 11 on lower part of anterior arch. Dorsal XVI. 



I 2* 



