240 



CllARACIXID^. 



ventral. Caudal peduncle as long as deep. Scales 29-30 |i, 2 between 

 lateral line and ventral. No markings, except a silvery lateral band, 



which is black-edged above. 



Fis. 183. 





Petersius xvoosnami. 

 Type. 

 Total length 70 millim. 

 Upper Congo (Aruwimi). 

 1-2. Types. Aruwimi River. 



R. B. Woosnam, Esq. (C.) ; 

 Ruwenzori Expedition. 



12. PETERSIUS OCCIDENTALIS. 

 Gunth. Proc. Zool. Soc. 1809, p. 731, pi. xlv. fig. B. 



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

 4 times. Head as long as deep, with nearly straight upper profile ; 

 jaws equal in front; snout much shorter than eye, which is 2 J to 2j 

 times in length of head and equals interorbital width ; maxillary 



Petersius occidentaUs, 

 Type, after Giinther (P. Z. S. 1899). 



extending to below anterior border of eye; 14 teeth Q) in upper jaw, 

 8 in lower ; inner prsemaxillary teeth inserted directly behind the outer. 

 Gill-rakers short, 12 or 13 on lower part of anterior arch. Dorsal III 8, 

 originating immediately behind vertical of base of ventral, and at equal 

 distance from end of snout and from caudal ; longest ray f to -f length 

 of head. Anal III 18-21. Pectoral shorter than head, not reaching 



