50 



MORMYRID.€. 



Fetrocephalus sauvayil, Bouleng. Proc. Zool. Soc. 1898, p. 788, and Poiss. Bass. 

 Congo, p. 70 (1901). 

 Depth of body 2f to 3J times in total length, length of head 3| 

 to 4 times. Head as long as deep, with straight, feebly declivous upper 

 profile ; snout very short, ^ to i length of head, obliquely truncate, 

 projecting beyond mouth ; mouth situated below anterior border of the 

 eye, its width f or ^ length of head; teeth bicuspid, 20-26 in upper 

 jaw, 28-30 in lower ; eye large, its diameter greater than length of snout, 

 equal to interorbital width. Dorsal 28-31, originating above 4th to 7th 

 ray of anal, its length a little more than half its distance from head. 

 Anal 35-38, equally distant from base of ventral and base of caudal, or 



Fi". :i5. 



Petrocejihalus m uvar/ ii . 

 Type. i. 



slightly nearer latter. Pectoral pointed, about | to J length of head, 

 twice as long as ventral, and extending beyond base of latter. Caudal 

 scaled at the base, with pointed lobes. Caudal peduncle 3 times as long 

 as deep, f to | length of head. 40-4G scales in lateral line, j^|"^ in 



transverse series on body, ^y"j2 in transverse series between dorsal and 

 anal, 12 round caudal j)eduncle. Plumbeous above, silvery white below ; 

 a round blackish spot sometimes present below origin of dorsal. 



Total length 100 miilim. 



Power Congo, Old Calabar. 



1. Tyi)e. Lower Congo. 



Loango, Lower Congo. 



^. Ad. 



•5. Ad. 



4. Skel. 



5. Hgr. 



Ponia, 

 Matadi, 



M. P. Hens (C). 

 M. De Meuso (C). 

 M, P. Dclhez ((J.). 



Capt. AVilverlh (C). 



