CHAEACIKID,^. 187 



Distinguished from the preceding by a more elongate body, longer 

 gill-rakers, fewer branched rays in the anal fin, and especially by the 

 more normal shape of the fins in the male, 



la. PBTERSIUS SEPTENTRIONALIS. 

 Bouleng. Ann. & Mag. N. H. (8) vii. 1911, p. 373. 



Depth of body equal to length of head, 3J to 3f times in total length. 

 Head twice as long as broad, longer than deep ; lower jaw projecting 

 slightly beyond snout ; snout shorter than eye, which is 2| times in 

 length of head and exceeds interorbital width ; maxillary extending to 

 below anterior border of eye ; outer prsemaxillary teeth 4, alternating 

 with those of the inner row, 8 in number ; 8 teeth in lower jaw. Gill- 

 rakers moderately long, 12 on lower part of anterior arch. Dorsal II 7, 

 originating above ventral, at equal distance from centre of eye and from 

 root of caudal. Adipose fin very small. Anal III 13-14. Pectoral 

 nearly as long as head, not quite reaching ventral. Caudal deeply 

 forked. Caudal peduncle a little longer than deep. Scales 25-26 gf. 

 1 or 1\ between lateral line and ventral. Sibery, finely speckled with 

 brown on the back ; a blackish lateral band ; fins white. 



Total length 45 millim. 



Portuguese Guinea. 

 1-5. Types. Geba E. at Bafata. Dr. W. J. Ansorge (0.). 



Distinguished from all the species with alternating prsemaxillary teeth 

 and a complete lateral line by the low number of scales in the lateral 

 line. 



Add :— 



8. PETERSinS PULOHER, BIgr. 



3. Ad. Sankuru R. at Kondue, M. E. Liija (C); Luxem- 



Kasai, Congo. burg Museum (P.). 



9. PETERSIUS MAJOR, Blgr. 

 Add :— 



13-15. Ad. Ju R. at Bitye. G. L. Bates, Esq. (C). 



10. PETERSIUS SPILOPTERUS, Blgr, 

 Add :— 



4-5. Ad. "Wari, Lower Niger. :\rr. J. Paul Arnold (P.). 



