OF FISHES FROM LAKE TANGANYIKA. 17 
to between the orbits, and the occipital crest is prolonged to it; the parietal crests are 
produced on the frontals ; the preorbital is large, and the chain of suborbitals very 
slender. The pharyngeal teeth have long slender shafts and conical brown cusps. The 
ribs are attached to the back of short transverse processes; all but the last one support 
epipleurals ; the last four preecaudal vertebrae have a hemal bridge. 
18. TILAPIA LABIATA, sp. n. (Plate V. fig. 1.) 
Outer teeth rather large, feebly notched ; inner teeth very small, tricuspid, in 3 or 
4 series. Depth of body equal to length of head, 22 to 22 times in total length. 
Snout with straight upper profile, 14 to 12 diameter of eye, which is 34 to 44 times in 
length of head and equals interorbital width; maxillary not extending to below 
anterior border of eye; 3 or 4 series of scales on the cheek; large scales on the opercle ; 
lips very strongly developed, both produced into a large triangular lobe in front. Gill- 
rakers moderate, 15 on lower part of anterior arch. Dorsal XVIII 10; middle dorsal 
spines longest, about 2? length of head, and a little shorter than longest soft rays. 
Pectoral 2 to 4length of head. Ventral reaching origin of anal. Anal III 6-7; third 
spine longest, as long as longest dorsals, slightly shorter than longest soft rays. 
Caudal truncate. Caudal peduncle slightly longer than deep. Scales finely 
denticulate on the border, 33-35 — ; lat. 1. — Pale olive, with 10 more or less 
distinct darker cross-bars; fins greyish-brown ; dorsal sometimes with oblique dark and 
light streaks ; caudal with numerous round dark spots between the rays, 
Total length 170 millim. 
Four specimens from Kinyamkolo. 
This species is easily recognizable by the extraordinary development of the lips, 
which bears a curious resemblance to that observed in the Central American Heros 
labiatus'. It appears to be nearest allied to Ctenochromis nuchisquamulatus Hilg., 
and C. sauvagii Pfeffer, from the Victoria Nyanza. 
TROPHEUS, g. 0. 
Body moderately elongate ; scales ctenoid, Jaws angularly bent at the sides, with 
bands of minute tricuspid teeth, an outer row of bicuspid teeth, and enlarged conical 
teeth at the sides of the premaxillary; mouth transversely linear when closed; 
maxillary concealed under the preorbital. Dorsal with 21 spines, anal with 6. 
Vertebre 33 (17-+16). 
This genus differs from Tilapia in the angularly-broken premaxilla armed with 
enlarged conical teeth at the sides, and the higher number of anal spines, 
The name proposed (spo¢etc, one who rears, brings up, educates) refers to the 
peculiar mode of nursing the eggs described hereafter. 
1 Giinther, P. Z. S. 1864, pl. iv. fig. 1. 
VoL. Xv.— PART I. No. 3.—December, 1898. D 
