POLYPTEEUS. 



13 



overlapping when folded. Anal 15. Pectoral widely separated from 

 first dorsal spine. 62-63 scales in a longitudinal series, 2-t— 25 between 

 occiput and first dorsal spine, 42 round middle of body. Olive above, 

 with ill-defined light spots, whitish beneath ; lips and gill-membrane 

 spotted with black ; dorsal fin spotted with black ; pectorals, ventrals, 

 anal, and caudal barred with black. 



Total length 370 millim. 



Upper Congo (Monsembe and Kassai River). 

 1. Type. Monsembe. 



Eev. J. H. Weeks (P.). 



7. POLYPTERUS DELHEZI. 

 Bouleng. Ann. Mus. Congo, Zool. i. p. 61, pi. xxx. fig. 2 (1899), and Poiss. Bass. 

 Congo, p. 23 (1901) ; Pellegr. Bull. Mus. Paris, 1904, p. 310. 



Body feebly compressed, subcylindrical. Head If to If times as long 

 as broad, 5^ to 6 times in total length, with lateral eyes and feebly 

 convex interorbital region ; jaws equal in front; eye 7| times in length 

 of head, 1^ times in interorbital width ; head-shields all paired ; a series 

 of 3 shields between postorbital and spiracular shields ; suboperculum 

 as large as eye, or a little larger. Dorsal with X-XI spines, not 



Fig. 9. 



Pdlypierus delhezi. 

 Type (A. M. C). f. 



overlapping when folded. Anal 11. Pectoral reaching or not quite 

 reaching vertical of first dorsal spine. 56 scales in a longitudinal series, 

 ] 4-1 7 between occiput and first dorsal spine, 38 round middle of body. 

 Brownish above, whitish beneath ; 7 black transverse bands on the back ; 

 fins mottled with dark brown. 

 Total length 340 millim. 



