rOLYPTERUS. 



3. POLYPTERUS CONGICUS. 



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



pi. xxx. 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 Jf 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, 



]§ 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 



Pohjptems ccngims. 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., i 



2. 



Yg. 



3. 



Yg. 



4. 



Yg- 



5. 



Ad. 



6- 



■9. Ad. 



10. 



Ad. 



type. Stanley Falls. 



New Antwerp, Upper Congo. 

 Bolobo, Upper Congo. 

 Bangala Country, Upper Congo. 

 Upper Congo. 

 Kalambo, L. Tanganyika. 

 Kituta, „ 



Rev. W. H. Bentley (C). 

 Capt. Wilverth (C). 

 Rev. G. Grenfell (P.). 

 M. De Meuse (C). 

 Brussels University. 

 Prof. J. E. S. Moore (C). 

 Dr.W.A.Cunnington(C). 



