OF FISHES FROM TAKE TANGANYIKA. 15 



covered with scales. Gill-rakers long, slender, and close-set, 20 on lower part of 

 anterior arch. Dorsal XII 14-15; spines increasing in length to the last, which 

 measures f length of head, and is nearly as long as the soft rays. Pectoral f length 

 of head. Ventral reaching origin of anal. Anal III 10-12; third spine longest, a 

 little shorter than longest dorsal. Caudal feebly emarginate. Caudal peduncle twice 

 as long as deep. Scales very finely denticulate on the edge, 39-40 j^ ; lat. 1. ^^. 

 Brown, lighter beneath ; dorsal and anal with or without brown longitudinal streaks ; 

 caudal spotted with brown or black at the base. 



Total length 87 millim. 



Two specimens from Kinyamkolo, and two from Mbity Rocks. 



Approaches P. longiceps Gthr. in the elongate body, but differs greatly in the 

 dentition, the shape of the snout, and the tin-formula. Only the Malagassy species of 

 the genus Paratilapia were known to have fewer than 13 spines in the dorsal fin ; but 

 one of the species described above [P. ventralis) has only 12 or 13. 



Bathybates, g. n. 



Body elongate ; scales cycloid, small and irregular. Several rows of large fang-like 

 teeth in the jaws. Maxillary exposed. Dorsal with 14 spines, anal with 3, 

 Vertebra 36 (17 + 19). 



This genus is closely related to Paratilapia, with which it is to a certain extent 

 connected by P. longiceps Gthr., from Nyassa. However, the more formidable 

 dentition, coupled with the character of the scales on the body, appear sufficient to 

 warrant the establishment of a new genus. The unique species appears in most 

 respects more specialized than Paratilapia longiceps, although more primitive than 

 any known species of that genus in the longer anal fin and the complete upper 

 lateral line. 



16. Bathybates ferox, sp. n. (Plate IV. fig. 2.) 



Teeth long and sharp, fang-like, wide apart, in 4 series in the upper jaw, in 3 in 

 the lower. Depth of body 4 times in total length, length of head 3 times. Snout 

 long and strongly compressed, with convex upper profile ; eye large, its diameter 

 If times in length of snout, 3^ in length of head, and a little greater than interorbital 

 width ; maxillary not quite reaching to below anterior border of eye ; 5 series of small 

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

 slender, 13 on lower part of anterior arch. Dorsal XIV 16; spines rather feeble, 

 slender, subequal from the fifth, which measures | length of head ; longest soft rays 

 ^ length of head. Pectoral f length of head. Ventral not reaching vent. Anal III 

 16 ; spines short and feeble. Caudal deeply forked, middle rays not half as long as 

 outer. Caudal peduncle nearly twice as long as deep. Scales small and irregular. 



