PETBOCEPHALUS. 



51 



6. Ad. 



7-8. Ad. & hgr. 



9-10. Ad. 

 10-12. Ad. & yg. 

 13-14. Yg. 



Bolobo, Upper T'oiioo. 

 Monsembe, „ 



C'oquilhatville, „ 

 Upper Congo. 

 Old Calabar. 



Rev. G. Grenfell (P.). 

 Rev. J. H. Weeks (P.) 

 M. P. Delhez (C). 

 Brussels University. 

 Miss Kingsley (C). 



3. PETROCEPHALUS ANSORGII. 

 Bouleng. Proc. Zool. Soc. 1902, ii. p. 325, pi. xxviii. fig. 2. 



Depth of body 3 times in total length, length of head 4^ times. 

 Head slightly longer than deep ; snout rounded, ^length of head ; mouth 

 situated below eye, its width ^ length of head ; teeth bicuspid, 10 in upper 

 jaw, 20 in lower ; nostrils a little above level of lower border of eye ; eye 

 large, tvt'ice as long as snout, 1^ interorbital width. Uorsal 33, originating 

 above 9th ray of anal, its length 1 J in its distance from head. Anal 39, 

 equally distant from base of ventral and from base of caudal. Pectoral 



Fig. 36. 





Petroci'phalus ansorr/ii. 4. 

 Type (P. Z. S. 1902). 



pointed, f length of head, twice as long as ventral and extending beyond 

 base of latter. Caudal with pointed lobes. Caudal peduncle 3 times as 

 long as deep, f length of head. 45 scales in lateral line, jy in transverse 

 series on body, p> in transverse series between dorsal and anal, 8 round 

 caudal peduncle. Silvery, brownish on the back and on the anterior 

 rays of the dorsal. 



Total length 105 millim. 



Lower Niger. 

 1_ Type. Agberi Dr. \V . J. Ansorge (C). 



£ '2 



