788 mb. g. a. boulengee on the fishes [nov. 15, 



1. Petkooephalus bane. 



Mormyrus bane, Lacep. Hist. Poiss. v. p. 620 (1803) ; Cuv. & 

 Val. xix. p. 276 (1846) ; Giinth. Cat. vi. p. 220 (1866). 



Mormyrus cyprinoides (non L.), Geoffr, Descr. Egypte, Poiss. 

 p. 277, pi. viii. tigs. 3 & 4 (1829). 



Mormyrus dequesne, Cuv. & Val. t. c. p. 281. 



? Mormyrus joannisii, Cuv. & Val. t. c. p. 282. 



Mormyrus ehrenheryii, Cuv. & Val. t. c. p. 283. 



Petroceplicdus bane, Marcusen, Bull. Ac. St. Petersb. xii. 1854, 

 p. 14, and Mem. Ac. St. Petersb. (7) vii. 1864, uo. 4, p. 146. 



Petroceplicdus dequesne, Marcusen, Bull. p. 14. 



? Petrocephalus de jocinnis, Marcusen, 1. c. 



Petrocephalus ehrenbergii, Marcusen, 1. c. 



Deptb of body 2h to 3^ times in total length, length of head 3| 

 to 4. Head as long as deep, rounded ; snout very short, ^ to ^ 

 length of head, rounded, projecting beyond the mouth ; mouth 

 situated below the eye, its width ^ to 5 length of head ; teeth bi- 

 cuspid, 14-22 io the upper jaw, 22-30 in the lower ; nostrils 

 close together, close to the eye and on a level with its lower 

 border ; eye large, longer than the snout, at least § interorbital 

 Avidth. Dorsal 29-33, originating above 6th to 10th ray of anal, 

 its length 1| to 2 in its distance from head. Anal 34-37, equally 

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

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

 beyond base of latter. Caudal with pointed lobes. Caudal peduncle 

 2^ to 3 times as long as deep, | to | length of head. 40-50 scales 

 in the lateral line, ^^ in a transverse hne on the body, ^^^ in a 

 transverse line between dorsal and anal, 12 round caudal peduncle. 

 Silverv, greyish on the back. 



Total length 195 millim. 



Nile. 



2. Petrocephalus sauvagii. 



Mormyrus {Petrocephalus) sauvagii, Bouleng. Ann. & Mag. N. H. 

 (5) xix. 1887, p. 149. 



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

 to 4. Head as long as deep, with straight, descending upper 

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

 projecting beyond the mouth ; mouth situated below the anterior 

 border of the eye, its width ^ length of head ; teeth bicuspid, 20- 

 24 in the upper jaw, 28-30 in the lower ; nostrils close together, 

 close to the eye ; eye large, its diameter greater than length of 

 snout, nearly equal to interorbital width. Dorsal 29-31, originating 

 above 4th or 5th ray of anal, its length a little more than half its 

 distance from head. Anal 35-36, equally distant from base of 

 ventral and base of caudal, or slightly nearer latter. Pectoral 

 pointed, about | 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 | 



