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Show 10 ON THE FISHES OF THE NIGER DELTA. [Jan. 15, 21. PELMATOCHROMIS T^ENIATUS, sp. n. (Plate IV. fig. 3.) Teeth in 2 series in the upper jaw, in 3 in the lower, outer largest. Depth of body 3 times in total length, length of head 3| times. Snout broad, rounded, with convex upper profile, as long as the eye, which is contained 3j 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 ; large scales on the opercle. Gill-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 g; lat. 1. •§. 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 upper border. Total length 75 millim. A single specimen. Also nearly allied to P. subocellatus. Readily distinguished from it, and from P. ansorgii, by the dorsal formula. 22. TlLAPIA MARLE Blgr. This species was described from a single specimen from Azumine Creek, Opobo River, 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. X V I 12-13 ; A. Ill 10 ; Sq. 29 30 % • lat. 1. £ § . 23. TlLAPIA LATA Gthr. GOBI1D.E. 24. ELEOTRIS SENEGALENSIS Stdr. EXPLANATION OF THE PLATES. PLATE II. Phractoliemus cmsorgii, with upper, lower, and side views of head, iind skeleton, p. 0. P L A T E III. Fig. 1. Marcusenius longianalis, p. 5. 2. Polycentropsis abbreviata, and skeleton, p. 8. PLATE IV. Fig. 1. Pelmatochromis ansorgii, p. 8. 2. ,, pulcher, p. 9. 3. „ tceniatus, p. 10. |