1898.] or THE FAMILY MORMTRIDJE. 789 



10-11 



length of head. 40-46 scales in the lateral line, ^^ in a trans- 



verse line on the body, j^-jg in a transverse line between dorsal 

 and ana], 12 round caudal peduncle. Plumbeous above. 



Total length 190 millim. 



Lower Congo, Old Calabar. 



3. Peteocephaltts bovei. 



Mormyrus hovei, Cuv. & Val. xk, p. 283 (1846) ; Griinth, Cat. vi. 

 p. 221 (1866) ; Steind. Sitzb. Ak. Wien, Ixi. i. 1870, p. 553. 



Petrocephalus hovei, Marcusen, Bull. Ac. St. Petersb. xii. 1854, 

 p. 14. 



Shape of head and body as in M. ham ; depth of body about 3| 

 times in total length. Dorsal 20-25 ; anal .31-33. 39-40 scales 

 in the lateral line. 



Nile, Senegal. — This species is only known to me from the 

 accoimts given by Valenciennes and by Steindaehner. 



4. Petjbocephalus balati. 



Petrocephalus halayi, Sauvage, Bull. Soc. Philom. (7) vii. 1883, 

 p. 159. 



Mormyrus amhly stoma, Giinth. Ann. & Mag. N. H. (6) xvii. 

 1896, p. 281, pi. xiv. fig. A. 



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

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

 ^ length of head, obliquely truncate, projecting beyond the mouth; 

 mouth situated below anterior border or centre of eye, its width g 

 length of head ; teeth bicuspid, 20-24 in the upper jaw, 30-36 in 

 the lower ; nostrils close together, close to the eye ; eye large, 

 its diameter greater than length of snout, | interorbital width. 

 Dorsal 21-24, originating above 4th or 5th ray of anal, its length 

 nearly g its distance from head. Anal 28-30, slightly nearer 

 base of caudal than base of ventral. Pectoral pointed, | 

 length of head, 1| length of ventral, extending beyond base of 

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

 peduncle 2| to 3 times as long as deep, f to | length of head. 

 35-37 scales in the lateral line, jj^ in a transverse line on the 

 body, ^ in a transverse line between dorsal and anal, 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 145 millim. 



Ogowe, Congo. 



5. Peteocephaius simtjs. 



Petrocephalus simus, Sauvage, Bull- Soc. Philom, (7) iii. 1878, 

 p. 100. 



Mormyrus {Petrocephalus) simus, Sauvage, N. Arch. Mus. (2) iii. 

 1880, p. 51, pi. ii. fig. 3. 



Mormyrus tenuicauda, Steind. Notes Leyd. Mus. xvi. 1894 

 p. 69, pi. iv. fig. 1. 



