236 



CHAEACINID^. 



3 times in total length, and only 14 gill-rakers on lower part of anterior 

 arch. Anal 22. 28 scales in lateral line. 



Total length 55 millim. 



Abba River, affluent of Uelle, Congo. — Type in Paris Museum. 



7. PETERSIUS CAUDALIS. 

 Bouleng. Ann. Mus. Congo, Zool. i. p. 89, pi. xxxvii. fig. 3 (1899), and Poiss. Bass. 

 Congo, p. 165 (1901). 



Depth of body 2-^ to 2J times in total length, length of head 3| to 

 4 times. Head as long as deep, with slightly concave upper profile ; 



Fig. 179. 



?^. 



^'177^rT~^ 



Petersius caiulalis. 

 Type (A. M. C). f. 



lower jaw projeeting beyond upper ; snout much shorter than eye, which 

 is 2| to 2| times in length of head and equals interorbital width ; 

 maxillary extending to below anterior border of eye ; outer prsemaxillary 

 teeth 4, alternating with the inner, 8 in number ; 8 teeth in lower jaw. 

 Gill-rakers rather long, 16-18 on lower part of anterior arch. Dorsal II 8, 

 originating immediately behind vertical of base of ventral, at equal 

 distance from end of snout and from caudal, longest ray as long as head. 

 Anal III-IV 19-20. Pectoral a little shorter than head, reaching or 

 nearly reaching ventral Caudal forked, with pointed lobes. Caudal 

 peduncle as long as deep. Scales 29-30 ^, 2 between lateral line and 

 root of ventral. Reddish, with a silvery lateral band, which becomes 

 blackish on the caudal peduncle and extends as a black band on the 

 caudal fin. 



Lower Congo. — Types in Congo Museum, Tervueren. 



1-2. Two of the types. Boma. M. P. Delhez (^C). 



3. One of the types of Congo. 11. College of Surgeons (P.). 



Alestes longipinnis. 



