OCR Text |
Show 106 MR. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, Synopsis of the Species. I. Scales cycloid, without marginal denticulation; third anal spine not longer than longest dorsal spine. A. Gill-rakers 15 to 25 on lower part of anterior arch ; 2 or 3 series of scales on the cheek. 1. Anal spines 4; pectoral not longer than head, not extending to origin of anal ; dorsal XV-XVII 10-12. Teeth in 7 or 8 series; caudal peduncle a little longer than deep ; maxillary extending to between nostril and eye ; diameter of eye 5 times in length of head; Sq. 3 5 ^ 1. hunteri Gthr. Teeth in 4 or 5 series ; caudal peduncle slightly deeper than long; maxillary extending nearly to below anterior border of eye; diameter of eye 5 to 5£ times in length of head ; Sq. 32'^-, 2. nigra Gthr. Teeth in 5 to 7 series; caudal peduncle not longer than deep ; maxillary extending to between nostril and eye ; diameter of eye 4 to 4| times in length of head; Sq. 31-32^ 3. shirana Blgr. B. Anal spines 3 (exceptionally 4 in T. mossam-bica). 1. Dorsal XV-XVIII 10-14; pectoral extending to origin of anal or beyond. a. Caudal rounded, the membrane between the rays scaleless, except at the base. Pectoral not longer than head; mouth large, nearly as broad as head ; Sq. 30-33,--r? 4. mossambica Ptrs. ^ 13-15 Pectoral at least as long as head ; mouth ^ to % width ofhead; Sq. 31-35 rr4? 5. nilotica L. ' u 14-lo b. Caudal truncate or slightly emarginate ; pectoral at least as long as head. a. Caudal peduncle at least as long as deep. Sq. 32-33 ^r^r. i lat- h "cTTo > dorsal spines equal in length from the sixth 6. tanganicm Gthr. 3--4- 19-21 Sq. 31-34 j g | ; lat. 1. r-- ; last dorsal spine longest. 7. natalensis M. Web. (3. Caudal peduncle deeper than long. * Maxillary not extending to below anterior border of eye. 31 t Sq. 31-34 ---,; mouth not more than half as broad as head 8. yalilcea Hasselq. tt Sq. 28-30 n^t|. II-1^ Depth of body much greater than length of head; last dorsal spine longest 9. microcephala Blkr. Depth of body not much greater than length of head ; last dorsal spine longest 10. macrocephala Blgr. Depth of body much greater than length of head; dorsal spines nearly equal in length from the sixth. 11. niyripinnis A. Dum. |