424 



Mr. G. A. Boulenger on new 



as the males, one specimen in this series being quite reddish 

 brown, suggesting the senicula group. 



The skulls of both sexes are rather smaller than those of 

 A. belzebul. 



Dimensions (in millimetres) : — 



XLVI. — Descriptions of Three new Freshwater Fishes from 

 West Africa. By G. A. Boulenger, F.R.S. 



(Published by permission of the Trustees of the British Museum.) 



Polypterus ansorgii. 



Body as deep as broad in front, its depth 1\ to 8 times in 

 total length. Head nearly twice as long as broad, 4 to 4£ 

 times in total length, much flattened, with supero-lateral 

 eyes and flat interorbital region; jaws equal in front; length 

 of snout 5 to 5J times in length of head ; eye 8 times in 

 length of head, 1^ to \\ times in interocular width; latter 

 less than distance between eye and spiracle; no azygous 

 shield between the nasals ; a series of 3 or 4 shields between 

 postorbital and spiracular shields ; suboperculum not or but 

 slighlly larger than eye. Dorsal with XIII or XIV spines, 

 all strongly overlapping when folded. Anal 12-13. Pectoral 

 reaching beyond vertical of first dorsal spine. 55 or 56 scales 

 in a longitudinal series, 11 to 13 between occiput and first 



* Skin dimensions taken from dried skins. 



