TILAPIA. 141 



** Caudal peduncle deeper than long. 

 t 18-27 gill-rakers; Sc. 29-34 ^. 



D. XV-XVII 12-14; A. Ill 10-12; Sc. 30- 



3—4- 

 34 A~i% ; mouth extending to below 



nostril, or slightly beyond 13. T. ffuKlcea, Art., p. 169. 



D. XV-XVII 11-13; A. Ill 9-11; Sc. 29- 



33 , , , 2 „ : mouth extending to between 



12-16 ° 



nostril and eye 14. T. andersonii, Cast., p. 171. 



2-3 

 11-13" 



tt 15-21 gill-rakers ; Sc. 27-31 : 



D. XIV-XVII 11-13; A. Ill 8-11 ; Sc. 27- 



30 ^^1 ; 15-19 gill-rakers ; depth o£ 

 body 2 to 2\ times in total length, much 



greater than length of head 15. T. heudeloti, A. Dum., p. 173. 



D. XIV-XVI 12-13 ; A. Ill 9-11 ; Sc. 28- 



31 j 2 ^, ; 18-21 gill-rakers ; depth of 



body 2\ to 2| times in total length . . .10. T. multifasdata, Gtlir., p. 175. 

 D. XV-XVI 10-12 ; A. Ill 7-9 ; Sc. 27- 

 30 ®=^L ; 15-18 gill-rakers ; depth of 

 body 21 to 2£ times in total length . . . 17. T. macrocephala, Blkr., p. 170. 



7. Outor teeth rather large (44 to GO in upper jaw) ; 3 or 4 series of 

 scales on the cheek ; 16-18 gill-rakers ; caudal rounded. 

 D. XVI 13 ; A. Ill 10 ; Sc. 33 § ; pectoral a 



little longer than head 18. T. ngomensis, Pellcgr., p. 178. 



D. XVI 12-13; A. Ill 9-10; Sc. 30-31 f| ; 



pectoral not longer than head . . . . 19. T. Jiaugi, Pellcgr., p. 178. 

 b. Caudal densely scaled ; 15-22 gill-rakers. 

 D. XVII-XVI1I 11 ; A. Ill 10 ; Sc. 33- 

 35 fo-To ; 3 or 4 series of scales on the 



x'2i~ xo 



cheek ; caudal peduncle longer than deep; [p. 180. 



caudal emarginate 20. T. auromartjinata, Blgr., 



I). XVI 10-12 ; A. Ill 8-9 ; Sc. 29-32 j^; 



2 or 3 series of scales on the cheek ; teeth 



extremely slender ; caudal peduncle deeper 



than long ; caudal rounded ..... 21. T. lepidura, Blgr., p. 181. 

 D. XVI 12 ; A. Ill 10 ; Sc. 29 || ; 2 series of 



scales on the cheek ; caudal peduncle 



deeper than long ; caudal emarginate, 



pointed above, rounded beneath .... 22. T. boulengeri, Pellegr., p. 182. 



