SPATHODUS. — PERISSODUS. 



497 



nostril ; teeth with reddish-brown crowns, 16 to 20 in each jaw ; cheek 

 and opercle naked. Gill-rakers short, 10 on lower part of anterior 

 arch. Dorsal XXIII 5 ; spines subequal from the fifth, -^ length of 

 head ; longest soft rays ^ length of head. Anal III 6-7 ; third spine a 

 little longer than longest dorsals. Pectoral f length of head. Ventral 

 reaching anal. Caudal rounded. Caudal peduncle deeper than long. 

 Scales feebly denticulate, 30-31 jg ; lateral lines ^. Blackish brown, 

 belly whitish ; caudal fin edged with whitish. 



Total length 70 millim. 



Lake Tanganyika. — Type in Congo Museum, Tervueren. 

 1. One of the types. Albertville. Capt. Heoq (C). 



Fig. 344. 





Spathodus erythrodon. 

 Type (A. M. C). 



36. PERISSODUS. 



Bouleng. Tr. Zool. Soc. xv. 1898, p. 20, and Poiss. Bass. Congo, p. 485 (1901) ; 

 Pellegr. Mem. Soe. Zool. France, xvi. 1904, p. 3G1. 



Body elongate, covered with small cycloid scales ; two incomplete 

 lateral lines. Teeth rather large, unequal in size, few, with swollen 

 base and low slightly notched crown, compressed transversely to the 

 axis of the jaws, disposed in a single series; maxillary exposed. Dorsal 

 with 18 spines, anal with 3. Vertebrae 35 (17 + 18). 



Lake Tanganyika. 



1. PERISSODUS MICROLEPLS. 

 Bouleng. 11. cc, Tr. p. 21, pi. vi. fig. 2 ; Pellegr. t, c. p. 3G2. 



Depth of body 3§ times in total length, length of head 3j times. 

 Head 2 \ times as long as broad ; snout a little broader than long, a 

 vol. hi. 2 k 



