OCR Text |
Show 116 MR. G. A. BOITLENGER ON THE AFRICAN AND [Feb. 7, Depth of body 2\ in total length, length of head 3 times. Snout with slightly concave upper profile, \\ diameter of eye, winch is 3g in length of head and \\ in interorbital width; mouth small, •f width of head, maxillary extending little beyond vertical of nostril; 2 series of scales on the cheek, forming a narrow oblique band ; large scales on the opercle. Gill-rakers short, 16 on lower part of anterior arch. Dorsal X V I 10; spines nearly equal in length from the 6th, which measures f- length of head and § longest soft rays. Pectoral pointed, a little longer than the head, extending to origin of anal. Ventral reaching vent. Anal III 8-9. Caudal truncate, slightly emarginate. Caudal peduncle a little deeper than long. Scales cycloid, 29 -|y ; lat. 1. yQ. Brown; indistinct darker oblique streaks on the soft dorsal. Total length 115 millim. Gaboon. 12. TILAPIA DTJMERILI. Chromis dumerilii, Steind. Verh. zool.-bot. Ges. Wien, xiv. 1864, p. 225, pi. vii. fig. 1. Teeth small, in 4 series in both jaws. Depth of body equal to length of head, 2\ to 2^ in total length. Snout with straight upper profile, nearly 1| diameter of eye, Avhich is about 4| in length of head ; mouth rather large; maxillary extending to below anterior border of eye ; 2 series of scales on the cheek. Dorsal X V 10; last spine longest, nearly | length of head, |- longest soft rays. Pectoral pointed, a little longer than the head, extending beyond origin of anal. Ventral reaching origin of anal. Anal III 9. Caudal truncate, scaly in the basal half. Caudal peduncle a little deeper than long. Scales cycloid, 30-31 -^; lat. 1. ^. Brown, each scale darker at the base; a very narrow blackish opercular spot. Total length 133 millim. West Africa. Apparently nearly allied to T. macrocephala, but distinguished by a larger mouth. 13. TILAPIA LEPIDURA, sp. n. Teeth very minute, in 4 closety-set series in both jaAvs. Depth of body 2-| to 2\ times in total length, length of head 2 | to 3. Snout with convex upper profile, \\ to \\ diameter of eye, Avhich is 3| to 4 times in length of head and 1^ to 2 in interorbital width ; mouth moderate, f width of head, extending to betAveen nostril and eye ; 2 or 3 series of scales on the cheek ; large scales on the opercle. Gill-rakers short, slender, 17 to 20 on lower part of anterior arch. Dorsal X V I 10; last spine longest, f length of head. Pectoral pointed, as long as head, extending as far as origin of anal. Ventral reaching vent. Anal III 8-9 ; third spine a little shorter than last dorsal. Caudal rounded, densely scaled. Caudal peduncle |