ciiAHAcnm)^. 1S7 



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. PETERSIUS SEPTENTRIONALIS. 

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



Depth of body equal to length of head, 3 J 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 2J times in 

 length of head and exceeds interorbital width ; maxillary extending to 

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

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

 rakers moderately long, .1 2 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 % 

 1 or 1^ between lateral line and ventral. Silvery, finely speckled with 

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



Total length 45 millim. 



Portuguese Guinea. 

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



Distinguished from all the species with alternating praem axillary teeth 

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

 line. 



Add :— 



8. PETERSIfJS PULOHER, BIgr. 



3. Ad. Sankuru R. at Kondue, M. E. Luja (C); Lnxem- 



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. Mr. J. Paul Arnold (P.). 



