40 ’ Mr. C. T. Regan— Classification of 
of Tilapia only T. zillii and T. busumana retain the sutural 
union of the ethmoid and vomer, and only T. buettikofert 
has the mandibular rami formed as in Limnotilap/a. 
5, Losocutnotes, Bou'eng., 1915 (type L. labiatus, 
Bouleng.). 
Dorsal XVII-XITX 9-11. Anal III 6-8. Scales feebly 
denticulate, large (33-35) ; two lateral lines. Mouth ter- 
minal ; lips thick ; 3 to 5 series of compressed teeth, outer- 
most bicuspid and inner tricuspid in young, all rounded or 
truncate, without cusps, in the adult. Lower pharyngeal 
with slender teeth and with a group of large blunt teeth in 
the middle posteriorly. Skeleton asin Limnotilapia dardennit; 
vertebre 32 (15+17). 
Tanganyika. A single species. 
6. GmuPHyRocHRoMIS, Bouleng., 1901 (type G. moorit, 
Bouleng.). 
Dorsal XVII 8. Anal IIT 7. Scales feebly denticulate, 
large (30); two lateral lines. Mouth subterminal, rather 
wide ; jaws with a band of small tricuspid teeth and an outer 
series of enlarged curved conical teeth, those of the pre- 
maxillaries gradually decreasing in size posteriorly, but the 
last 2 or 3 on each side again enlarged. 
Tanganyika. <A single species. 
Very near Limnotilapia and Simochromis. 
°° 
7. Srmocnromis, Bouleng., 1898 (type S. dtagramma, 
Giinth.). 
Dorsal XVII-XIX 9-10. Anal III 7-9. Scales feebly 
denticulate, large (33-36) ; two lateral lines. Mouth sub- 
terminal, rather wide ; jaws with a band of small tricuspid 
teeth and an outer series of larger teeth which are bicuspid 
anteriorly and conical at the sides of the premaxillaries. 
Lower pharyngeal triangular, with slender uni- or bicuspid 
teeth. Vertebree 32 (15+17). Skeleton as in Limnotilapia 
dardennit. 
Tanganyika ; a single species. 
Simochromis differs from Limnotilapia in the form of the 
mouth and from Gephyrochromis in the dentition. 
