On Two neio Fishes from West Africa. 29 



Plate III. 



Fiff. 1. Perisphinctes cf. torquatvs, J. de C. Sowerby, sp. 1 a, lateral 

 aspect ; 1 ^, a portion of the periphery at the point marked 

 ■with a cross in 1 a. Near the villages of Al-Kura and Samma, 

 15 miles N.E. of Dihala. (P. 14.) 



Fiy. 2. Perisphinctes cf. «Jrtf?zen«2s, P. Choffat. Lateral aspect of exserted 

 portion of fossil, the rest being obscured by matrix. Near 

 the villages of Al-Kura and Samma, 15 miles N.E. of Dihala. 



Fiy. 3. Perisphinctes cf. pottingen, J. de 0. Sowerby, sp. 3 a, lateral 

 aspect of fragment ; 3 b, peripheral view of the same. Near 

 the villages of Al-Kura and Samma, 15 miles N.E. of Dihala. 

 (P. 18.) 



Fig. 4. Oppelia ? sp, A smooth internal cast probably referable to this 

 genus. Near the villages of Al-Kura and Samma, 15 miles 

 N.E. of Dihala. (P. 19.) 



Note. — Except where notified, the figures on these Plates are drawn 

 of the natural size. 



II. — Descriptions of Two new Gyprinodontid Fishes from 

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



Fimdulus arnoldi. 



Depth of body 4^ to 5^ times in total length, length of 

 head 3 to 3^ times. Snout a little shorter than eye, the 

 diameter of which is 3 J times in length of head; lower jaw 

 projecting beyond upper; interorbital width ? length of head. 

 Dorsal 15-16, originating slightly in advance of anal, above 

 tenth or eleventh scale of lateral line, and at equal distance 

 from eye and from root of caudal ; longest (posterior) ray 

 quite as long as head in males, shorter in females. Anal 

 15-17, similar to dorsal. Pectoral about § length of head. 

 Caudal rounded in females, with upper and lower rays pro- 

 duced in males. Caudal peduncle twice as long as deep. 

 Scales 25-27 in longitudinal series, 20-22 round body ; an 

 interrupted series of lateral line pits. Pale olive, spotted or 

 dotted with crimson on the head, body, and vertical fins. 

 According to Mr. Arnold's coloured sketches, the male has a 

 blackish ba'^' ^long the upper part of the dorsal and anal 

 fins. 



Total length 45 mm. 



Several specimens were presented to the British Museum 

 by Mr. J. P. Arnold, of Hamburg; this fish, which he kept 

 in his aquarium, formed part of an interesting series brought 



