] Q ON THE nSHES OP IHB NIGER DELTA. [Jan. 15, 



21. Pelmatocheomis t.eniatus, sp. n. (Plate IV. fig. 3.) 

 Teeth in 2 series in the upper jaw, in 3 in the lower, outer largest. 



Depth o£ body 3 times in total length, length of head 34 times. 

 Snout broad, rounded, with convex upper profile, as long as the 

 eye, which is contained 3^ times in length of head and nearly 

 equals interorbital width ; maxillary extending slightly beyond 

 vertical of anterior border of eye ; 2 series of scales on the cheek ; 

 larwe scales on the opercle. Grill-rakers short, 11 on lower part 

 of anterior arch. Dorsal XVIII 7 ; spines gradually increasing 

 in length to the last, which measures half length of head; 

 longest soft rays produced into a filament, as long as head. 

 Pectoral ^ length of head. Ventral produced into a filament, 

 extending beyond origin of anal. Anal III 7 ; third spine as long 

 as longest dorsal. Caudal rounded. Caudal peduncle a little 

 deeper than long. Scales smooth, 28 ^ ; lat. 1. g. Brownish 

 above, yellowish beneath ; two blackish longitudinal bands on 

 each side, the upper from the occiput to the base of the soft dorsal, 

 the lower from the eye, over the opercle, to the root of the caudal ; 

 fins greyish, ventrals white with a black outer border ; oblique dark 

 streaks on the soft dorsal ; small blackish spots on the caudal 

 and two larger ones edged with white on its upiier border. 



Total length 75 millim. 



A single specimen. 



Also nearly allied to P. suhocellatus. lieadily distinguished from 

 it, and from P. ansorgii, by the dorsal formula. 



22. TiLAPIA MAEI.E Blgr. 



This species was described from a single specimen from Azumine 

 Creek, Opobo Eiver, in Miss Kingsley's collection. Three 

 specimens are in Dr. Ansorge's collection,' the largest measuring 

 135 millim. The caudal fin is rounded rather than truncate. 

 D. XVI 12-13 ; A. Ill 10 ; Sq. 29^ 30 | ; lat. 1. ^. 



23. TiLAPIA LATA Grthr. 



G-OJiIll)/E. 



24. Eleotkis senegalensis Stdr. 



EXPLANATION OF THE PLATES. 

 Plate IL 



PhractoUeiHua ansorgii, with upper, lower, and side views of head, 

 and skeleton, p. 6. 



Plate III. 

 Fig. L Marcusenitos longicmcdis, p. 6. 



2. Polycentropsis abbreviata, and skeleton, p. 8. 



Plate IV. 

 Fig. 1. Pehnatochromis ansorgii, p. 8. 

 •^- >> piilcher, p. 9. 



"• J, tceniatus, p. 10. 



