PAEATILAPIA. 337 



Very closely related to the preceding, but mouth not quite reaching 

 to below anterior border of eye, and caudal fin truncate in the young, 

 feebly but distinctly emarginate in the adult. Teeth of outer series 

 bicuspid in the young, very rarely in the adult, unicuspid in the latter; 

 the other teeth tricuspid. Coloration and sexual differences as in 

 P. serranus, but dark longitudinal bands constantly absent. 



Total length 200 millim. 



Lake Victoria and Victoria Nile. — Type in Paris Museum. 



Mr. E. Degen (C). 



Dr. E. Bayon (C.) ; 



Genoa Museum (P.). 

 Mr. M. Simon (C). 

 A. Blayuey Percival, Es(j. 



(P.). 

 22. Ad. L. Victoria. Dr. E. Baj^on (C.) ; 



Genoa Jluseum (P.). 



23-24. Hgr. & yg. Jinja, Riiion Falls. 



20. PARATILAPIA BAYONI. 

 Bouleng. Ann. Mus. Genova, (3) iv. 1909, p. 304, fig., and v. 1911, p. 65. 



Depth of body equal to or a little less than length of head, 2f to 3^ 

 times in total length. Head 2^ to 2f times as long as broad ; lower 

 jaw slightly projecting; snout longer than broad, with straight upper 

 profile, 1\ (young) to 2 times as long as eye, which is 3| (young) to 5 

 times in length of head, a little less than interorbital width, and equal 

 to depth of prseorbital ; mouth not extending to below anterior border 

 of eye; teeth in 3 or 4 series, inner very small, outer large and few, 

 almost canine-like in the middle part of the jaws (hi- or tricuspid in the 

 youno') ; 4 series of scales on the cheek, width of scaly part equal to 

 diameter of eye. 9 or 10 gill-rakers on lower part of anterior arch, 

 some T-shaped. Dorsal XIV-XVI 9-10 ; spines rather feeble, in- 

 creasing in length to the last, which measures y to f length of head ; 

 longest soft ray | to ^ length of head. Anal III 9-10 ; third spine \ 

 to - len"-th of head. Pectoral f to | length of head, not reaching 

 vertical of origin of anal. Ventral reaching origin of anal in the female, 

 produced into a very long filament in the male. Caudal rounded- 

 subtruncate. Caudal peduncle IJ to If times as long as deep. Scales 



VOL. III. ^ 



