156 ME. G. A. BOULENGER ON A COLLECTION 



Closely allied to the preceding species. Differing in the longer dorsal spines, fewer 

 anal rays, and in the ]iresence of a black spot on the dorsal. 



I have been able to examine the skeleton of this species. The occipital crest is 

 strong and extends to between the orbits ; a more feeble parietal crest. The median 

 pharyngeal teeth have rounded spheroidal crowns. 12 prascaudal and 19 caudal 

 vertebraj ; the last prsecaudal vertebra bears a haemal arch. It is not without interest 

 to point out the parallelism that can be drawn in comparing Trematocara (with its 

 excessively developed cephalic cavities) with the perch-like Cichla on the one hand and 

 Acerina and Perca, among Percidce, on the other : — 



Acerina: Vert. 15 + 19 = 34. 



Perca : Vert. 21-22 + 19-21 =41-42. 



Trematocara: Vert. 13 + 19 = 31. 

 Cichla : Vert. 18-19+17 = 35-36. 



The two genera in each family standing very nearly in the same relation to each 

 other both as regards the skull and the vertebral column. 



35. Telmatochkomis temporalis Blgr. 



Kibwesi. 



Gephykochromis. 



Bouleng. Ann. & Mag. N. H. (7) vii. 1901, p. 4. 



A band of very small tricuspid teeth in each jaw, with an outer series of larger conical 

 teeth bent inwards; lateral teeth conical. Maxillary exposed. Body moderately 

 elongate; scales cycloid ; two lateral lines. Dorsal with 17 spines, anal with -3. 



Differs from Paratila.pia as Telmatochromis differs from Lamprologiis. 



36. Gephyeochromis moorii. (Plate XX. figs. 1, 1 a.) 

 Bouleng. I. c. 



Depth of body equal to length of head, 3 times in total length. Snout with slightly 

 convex upper profile, as long as the diameter of the eye, which is contained 3f times 

 in length of head and equals interocular width ; maxillary extending to between nostril 

 and eye ; 56 conical teeth, with brown points, in the upper jaw ; 3 series of scales on 

 the cheek ; larger scales on the opercle. Gill-rakers short, 13 on lower part of anterior 

 arch. Dorsal XVII 8 ; spines increasing in length to the last, which measui-es f length 

 of head and f longest soft rays. Pectoral nearly as long as head. Ventral produced 

 into a long filament extending beyond origin of anal. Anal III 7 ; third spine longest, 

 a little shorter than last dorsal spine. Caudal rounded. Caudal peduncle as long as 

 deep. Scales 30 ^ ; lat. 1. % Uniform pale brown. 



Total length 120 millim. 



A single specimen from the north end of Lake Tanganyika. 



37. SlMOCHROMlS DIAGRAMMA Gthr. 



Msambu. 



