156 ME. G. A. BOULENGEE ON A COLLECTION 



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

 anal rays, and in the presence 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 prsecaudal and 19 caudal 

 vertebrae ; 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 : — 



Trematocara: Vert. 12+19 = 31. 

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



Acerina : Vert. 15 + 1 9 = 34. 



Perca : Vert. 31-23 + 19-31 = 41-43. 



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. Telmatocheomis temporalis Blgr. 



Kibwesi . 



Gephyeocheomis. 



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 Paratilapia as Telmatochromis differs from Lamprologus. 



36. Gephyeocheomis mooeii. (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 3|^ 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 measures 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. SlMOCHKOMIS DIAGEAMMA Gthr. 



Msambu. 



