PLECODUS. 



503 



40. PLECODUS. 



Bouleng. Tr. Zool. Soo. xv. 1898, p. 22. and Poiss. Bass. Congo, p. 488 (1901) ; 

 Pellegr. Mem. Soc. Zool. France, xvi. 1904, p. 3G2. 



Body elongate, covered with small cycloid scales ; two lateral lines, 

 the upper nearly complete. Teeth in a single series, large and few, 

 unequal in size, compressed, lamellar and a little concave in front, truncate 

 and strongly curved backwards ; maxillary exposed. Dorsal with 18 

 to 20 spines, anal with 3. Parietal and occipital crests very strong, 

 extending to between the orbits. Vertebrse 38 (18 + 20). 



Lake Tanganyika. 



Fis. 349. 





Plecodus paradoxus. 

 Niamkolo, |. Head and dentition of type-specimen, enlarged. 



1. PLECODUS PARADOXUS. 

 Bouleng. II. cc, and Ann. Mus. Congo, Zool. i. p. 152, pi. lii. fig. 4 (1900); 



Pellegr. 1. c. ; Bouleng. Tr. Zool. Soc. xvii. 1906, p. 574. 

 Plecodus Umaculatus, Steind. Anz. Ak. Wien, 1909, p. 426. 



Depth of body nearly equal to length of head, 31 to 4 times in total 

 length. Head twice as long as broad ; snout broader than long and 



