1902. J FISHES FKOM THE NIGER DELTA. 325 



3. PoLYPTERUS SENEGALUS Ouv. — Assay, Abo. 



The young specimens of these three species obtained by 

 Dr. Ansoi'ge have been described and figured in P. Z. S. 1902, i. 

 p. 4, pis. X. & xi. 



Lepidosirenid^. 



4. Protopterus annectexs Owen. (Plate XXYIII. fig. 1.) 



Three young specimens, 160 to 215 millim. long. The limbs 

 are longer than in specimens of P. cethiopictos and P. dolloi of 

 corresponding size, the fore limb extending to the vent, or beyond. 

 Head 3| to 4 times in distance from end of snout to vent ; eye 7 

 to 8 times in length of head, 1| to 2 in interorbital width. 

 50 scales in a longitudinal series from gill-opening to vent, 38 

 round the middle of the body. The longest external gills 

 measure § the length of the head. Vent on the left side in two 

 specimens, on the right in the third. 



The following are the measurements of the largest specimen : — 

 Total length 215 millim. ; head 24 ; head to vent 70; head to 

 origin of dorsal 30 ; fore limb 80 ; hind limb 56. 



MORMYRID^. 



5. MoRMYROPS DELiciosus Leach. — Agberi, Assay. 



6. Petrocephalus simus Sauv. — Agberi. 



7. Petrocephalus ansorgii, sp. n. (Plate XXYIII. fig. 2.) 



Depth of body 3 times in total length, length of head 45. Head 

 slightly longer than deep ; snout rounded, -^ length of head ; mouth 

 situated below the eye, its width -i- length of head ; teeth bicuspid, 

 10 in the upper jaw, 20 in the lower; nostrils close together, 

 close to the eye, a little above the level of its lower border ; eye 

 large, twice as long as the snout, I5 interorbital width. 

 Dorsal 33, originating above 9th ray of anal, its length 1^ in its 

 distance from head. Anal 39, equally distant fiom base of 

 ventral and from base of caudal. Pectoral pointed, | leng-th of 

 head, twice as long as ventral and extending beyond base of 

 latter. Caudal with pointed lobes. Caudal peduncle 3 times as 

 long as deep, § length of head. 45 scales in the lateral line, 

 ^ in a transverse series on the body, ^ in a transverse series 

 between doi-sal and anal, 8 round caudal peduncle. Silvery, 

 brownish on the back and on the anterior rays of the dorsal. 



Total length 105 millim. 



A single specimen from Agberi. 



This species is well distinguished from all others of the same 

 genus in having only 8 scales round the caudal peduncle. It 

 approaches P. bane Lacep. in the number of dorsal and anal 

 rays, but differs in the larger eye and the fewer teeth. 



8. Marcusenius brachyhistius Gill. — Agberi. 



