492 



SILUEID.E. 



barbel. Occipito-nuchal shield broader than long. A striated, acutely 

 pointed humeral process. Dorsal I 6 ; spine striated, f length of head. 

 Adipose fin 3 times as long as deep, § its distance from rayed dorsal. 

 Anal 9 (3 rays rudimentary). Pectoral spine striated, serrated on inner 

 border, f length of head. Ventral reaching origin of anal. Caudal 



AtojpocTiilas macroeephalus. 

 Type. 



peduncle slightly longer than deep. Slate-grey when fresh, with three 

 yellowish bars on the body, the first above the pectoral fin, the second 

 in front of the adipose fin, the third on the caudal peduncle ; head 

 greenish grey above, greenish yellow beneath; fins greenish yellow, 

 ventrals, anal, and caudal with a dark brown bar. 



Total length 75 millim. 



Kwango River (Congo System), Angola. 

 1. Type. Kwango R. at Fort Don Carlos. Dr. W. J. Ansorge (C). 



33. MOCHOCUS. 



Joamiis, Miig. Zool. 1835, iv. ; Gunth. Cat. Fish. v. p. 21 7 (1864) ; Bouleng. Ann. 



& Mag. N. H. (7) vi. 1900, p. 525, and Fish. Nile, p. 388 (1907). 

 Eldnoglanis, Gunth. t. c. p. 216. 



Body moderately elongate, slightly compressed. Anterior dorsal 

 ending over the ventrals, formed of a strong spine and 6 to 8 branched 

 rays ; a second dorsal, formed of soft rays *, above the short anal fin. 



* This second dorsal fin corresponds to the adipose fin of most Siluridae ; the rays are 

 true articulated rays, but, as in Clarotes, they are devoid of endoskeletal supports, or 

 interneurals. 



