PETRQCEPHALUS. 



•53 



10 or 12 round caudal peduncle. Brown above, silvery below ; a dark 

 spot at base of caudal, and another below origin of dorsal. 



Total length 170 millim. 



Ogowe, Congo. — Type in Paris Museam. 



1. Ad. (Type of M. ambly stoma.) Talagouga, Ogowe. Miss Kingsley (C). 

 2-4. Ad. & hgr. Komadekke, Ogowe. Dr. W. J. Ansorge (C). 



5. PETROCEPHALUS SIMUS. 

 Sauv. Bull. Soc. Philom. (7) iii. 1878, p. 100 ; BouPng. Proc. Zool. Soc. 1898, 



p. 789, and Poissi Bass. Congo, p. 73 (1901) ; Pappcnh. Mitth. Zool. Mus. 



Beil. iii. 1907, p. 314. 

 Alormyrvs (Fetrocephalus) simits, Sauv. N. Arch. Mus. ('2) iii. 1880, p. 51, 



pi. ii. fig. 3. 

 Mormyrus tenidcauda, Steind. Notes Leyd. Mus. xvi. 1891, p. 69, pi. vi. fig. 1. 

 Mormyrus siimis, Giinth. Ann. & Mag. N. H. (6) xvii. 1890, p. 282. 



Depth of body 2 J to '6^ times in total length, length of head oh to A\ 

 times. Head as long as deep, with convex upper profile ; snout very 

 short, y length of head, obliquely truncate, projecting beyond mouth ; 

 mouth below anterior border of eye, its width P to \ length of head; 

 teeth bicuspid, 10-18 in upper jaw, 16-24 in lower ; nostrils near lower 

 border of eye; eye rather large, a little longer than snout, -| inter- 

 Fig. 33. 



Petrooenhalvs simus. 



Type, after Sauvage (N. Arch. Mus. 1SS0). 



orbital width. Dorsal 24-28, originating above 5th to 7th ray of anal, 

 its length If to 2 times in its distance from head, and equal to or 

 slightly greater than its distance from caudal. Anal 30-34, equally 

 distant from base of ventral and from base of caudal. Pectoral pointed, 

 ■f length of head, twice as long as ventral, extending beyond base of 

 latter. Caudal scaled at the base, with pointed lobes. Caudal peduncle 



