18 MR. G. A. BOULENGER ON A COLLECTION 
19. TRoPHEUS MOORII, sp. n. (Plate V. fig. 2.) 
Teeth minute, those of the outer series tipped with brown and numbering about 50. 
Depth of body 2} to 23 times in total length, length of head 51 to 33. Snout 
descending in a strong curve, as long as or a little longer than the diameter of the eye, 
which is 3$ to 4 times in length of head, and equals 2 to ? 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, 11 or 12 on lower part of anterior arch. Dorsal 
XXI 5-6; spines increasing in length to the sixth, which measures not quite half 
length of head; longest soft rays 2 to ? length of head. Pectoral as long as head. 
Ventral produced into a short filament, reaching beyond origin of anal. Anal VI 5-6; 
spines increasing in length to the last, which slightly exceeds longest dorsal. Caudal 
22-25 
11-12 
Dark brown; a large bluish-white blotch on each side; belly reddish brown; fins 
blackish. 
Total length 110 millim. 
Five specimens from Kinyamkolo. 
The occipital crest is very strong and the parietal crests are produced on the frontals. 
The insertion of the ribs is as described in the preceding genera Telmatochromis and 
Eretmodus. 
slightly notched. Caudal peduncle as long as deep. Scales 30-32 = lat. 1. 
The mouth and pharynx of one of the specimens contains four eggs of very large 
size, the vitelline sphere measuring 4 millimetres in diameter, with an embryo in an 
advanced stage of development. The egg of the Fifteen-spined Stickleback (Gasterosteus 
spinachia), hitherto regarded as the largest Teleostean egg in proportion to the size 
of the animal, measures only 3 millimetres in diameter’. Besides the Siluroids of 
the genera Arius and Galeichthys, which have very large eggs, at least two species 
of Tilapia were known to give shelter to their eggs in the manner noticed above, viz.. 
T. simonis Gthr. (Chromis paterfamilias Lortet), as observed by Prof. Lortet in 
Lake Tiberias, and 7. nilotica Cuv., as noticed by me ina specimen collected by Canon 
Tristram in the same lake. But these eggs, produced by fishes of the size of our 
common Perch, are very numerous, and measure only about 2 millim. in diameter. It 
has besides been observed in these Zilapi, as well as in the Siluroids, that the function 
of protecting the eggs devolves on the male sex, while, to my surprise, the 
Langanyika fish proved on autopsy to be a female. Whether this is constantly so, or 
whether either parent takes to the nursing duties, remains to be ascertained by 
examination of a larger number of specimens. I am all the more disposed to think 
the latter possibility will be confirmed, from the fact that a specimen of Tilapia nilotica 
’ The absolutely largest known Teleostean egg is that of the Siluroid Arius commersonii, which measures 17 
millim. in diameter. The size of the Avrius-ege is much underrated by Giinther (‘ Study of Fishes,’ p. 160) and 
by McIntosh and Masterman (‘British Marine Food Fishes,’ p. 12), who ascribe toit a maximum of 10 millim 
