POLTPTERUS. 



3. POLYPTERUS OONGICUS. 



Bouleng. Ann. & Mag. N. H. (7) ii. 1898, p. 418, Ann. Mus. Congo, Zool. i. 

 pi. xsx. fig. 1 (1899;, Poiss. Bass. Congo, p. 22 (1901), Proc. Zool. Soc. 

 1902, i. p. 123, pi. xi. fig. 1, and Tr. Zool. Soc. xvi. 1901, p. 142, and xvii. 

 1906, p. 544. 



Head rather depressed, 1-| to If times as long as broad, its length 

 4 to 5 times in total length ; lower jaw projecting a little beyond snout ; 

 eye supero-lateral, its diameter 8 (young) to 12 times in length of head, 



1§ to 3 times in width of interorbital region, 

 which is flat ; nasal shields usually separated, 

 in the adult, by a small azygous shield ; a 

 series of 4 or 5 shields between postorbital 

 and spiracular shields; suboperculum much 

 larger than eye. Dorsal with XII-XIV 



— f'r^^j^^SS 'ya 



Folypterus congicns. Type. 



spines, anterior more or less overlapping when folded. Anal 12-15. 

 Pectoral reaching vertical of first dorsal spine, or beyond. 55-59 

 scales in a longitudinal series, 11-15 between occiput and first dorsal 

 spine, 46-52 round middle of body. Olive above, yellowish beneath ; 

 6 to 8 more or less regular blackish narrow transverse bands on the 

 body ; fins spotted or mottled with blackish. 



Total length 720 millim. 



Congo, Lake Tanganyika. 



1. Ad., type. Stanley Falls. Eev. W. H. Bentley (C). 



2. Yg. New Antwerp, Upper Congo. Capt. Wilverth (C). 



3. Yg. Bolobo, Upper Congo. Eev. G. Grenfell (P.). 



4. Yg. Bangala Country, Upper Congo. M. De Meuse (C). 



5. Ad. Upper Congo. Brussels University. 

 6-9. Ad. Kalambo, L. Tanganyika. Prof. J. E. S. Moore (C). 



10. Ad. Kituta, „ Dr.W.A.Cunnington(C.). 



