262 



SILURIDjE. 



11 times as long as broad, smooth; occipital process very short and 

 forming a very open angle ; frontal fontanelle sole-shaped, | length of 

 head ; occipital fontanelle smaller, in advance of occipital process ; 

 eye \ length of snout, \ interorbital width, which is a little less than 

 \ length of head and equals width of mouth ; band of prasmaxillary 

 teeth 4 times as long as broad; vomerine teeth conical, forming a 

 crescentic band which is as broad as the prfemaxillary band; nasal 

 barbel % length of head*. Gill-rakers 

 rather long, 15 on anterior arch. Clavicles 

 feebly striated and covered with a thin 

 skin. Dorsal 80, its distance from occipital 

 process f length of head. Anal 65. 

 Both dorsal and anal embracing root of 



Fig. 217. 





Clarias amplexicauda. 

 Type (A. M. C). f. 



caudal. Pectoral f length of head, its spine serrated on both sides 

 and measuring § the length of the fin. Ventrals once and -| as distant 

 from caudal as from end of snout. Caudal a little more than \ length 

 of head. Blackish brown above, a little lighter beneath. 



Total length 155 millim. 



Upper Ubanghi. — Type in Congo Museum, Tervueren. 



31. CLARIAS THEODORA. 



M. Weber, Zool. Jahrb., Syst. x. 1897, p. 150 ; Bouleng. Proc. Zool. Soc. 1907, 

 p. 1089. 



Depth of body 6 to 7 times in total length, length of head i\ to h\ 

 times. Head If or \\ times as long as broad, smooth; occipital process 

 angular, broader than long ; frontal fontanelle sole-shaped, twice as long 

 as broad and \ length of head ; occipital fontanelle smaller, in advance of 

 occipital process ; eye very small, 3 times in length of snout, 5 to 6 times 

 in interorbital width, which equals width of mouth and a little less than 



* The other barbels are mutilated in the single known specimen. 



