OF FISHES FROM LAKE TANGANYIKA, 19 
with the pharynx filled with embryos belongs to the female sex, while Dr. Lortet’s 
observations on 7’. simonis had led to the belief that specimens carrying eggs in that 
manner are invariably males. 
It is here necessary to recall the observation contained in Livingstone’s ‘ Last 
Journals,’ vol. ii. p. 17, that the “ Dagala” or ‘“ Nsipé,” of Lake Tanganyika, a small 
fish 2 or 3 inches long, and very like Whitebait, is said to emit eggs by the mouth. 
The comparison of this fish to Whitebait excludes the possibility of the one here 
described being the “Dagala” or “Nsipé,” which will probably prove to be a 
Cyprinodont, if not actually the Haplochilus tanganicanus described below. 
SIMOCHROMIS, g. n. 
Body moderately elongate; scales ctenoid. Jaws with broad bands of minute 
tricuspid teeth, with an outer series of larger bicuspid teeth, and a single series of 
conical teeth at the sides of the premaxillary ; maxillary concealed under the pre- 
orbital. Dorsal with 17 or 18 spines, anal with 3. Vertebree 51-32 (15+ 16-17). 
The type species differs from the other members of the genus to which it was 
originally referred in the differentiation of the teeth at the sides of the premaxillary, 
a character in which it agrees with the genus Zropheus. 
20. SIMOCHROMIS DIAGRAMMA Gthr. 
Chromis diagramma Giinth. Proc. Zool. Soc. 1893, p. 632, pl. lviii. fig. 3. 
The bands of teeth in both jaws consisting of 8 to 10 series, gradually decreasing in 
size from the outer border. Depth of body 23 to 2% times in total length, length of 
head 34 to 34. Snout descending in a strong curve ; diameter of eye 3 to 34 times in 
length of head, 14 in interorbital width ; mouth extending to below anterior border of 
eye; 4 series of scales on the cheek ; large scales on the opercle. Gill-rakers short, 
12 or 13 on lower part of anterior arch. Dorsal XVII-XVIII 9-10 ; spines increasing 
in length to the sixth, which measures 3 to 3 length of head; longest soft rays about % 
length of head. Pectoral as long as head. Ventral reaching vent or origin of anal. 
Anal III 7-8; third spine longest, as long as longest dorsal. Caudal truncate. Caudal 
peduncle as long as deep. Scales 31-33 as lat. 1. ae Olive, whitish beneath ; 
young with 9 rather indistinct vertical bars; gill-membrane sometimes with dark brown 
spots; fins greyish; a dark brown stripe may be present along the spinous dorsal, 
which has a black edge. 
Total length 105 millim. 
Four specimens from Kinyamkolo. 
