CLAEIAS. 



257 



on both sides, f the length of the fin. Ventrals much nearer end of 

 snout than caudal. Caudal \ length of head. Dark brown. 



Total length 205 millim. 



Gambia. 

 1. Type. Gambia. Mr. J. T. Dalton (C). 



25. CLARIAS DUMERILII. 



Steind. Verh. zool.-bot. Gres. Wien, xvi. 1866, p. 766, pi. xiii. fig. 8, & pi. xiv. 

 fig. 5 ; Bouleng. Proc. Zool. Soc. 1907, p. 1085. 



Depth of body 6 to 7^ times in total length, length of head 4 to 4J 

 times. Head 1^ to 1-J times as long as broad, smooth above ; occipital 

 process angular ; frontal fontanelle sole-shaped, about twice as long as 

 broad ; occipital fontanelle smaller, usually extending on the occipital 

 process ; eye very small, its diameter 3 times in length of snout, 6 or 7 

 times in interorbital width, which, like the width of the mouth, 

 measures J length of head ; band of prsemaxillary teeth 4 times as long 



Tig. 213. 



Clarias dumerilii. 

 Type, after Steindachner (I. c). 



as broad ; vomerine teeth conical or subgranular, forming a crescentic 

 band which, in the middle, is a little narrower than the pramaxillary 

 band ; nasal barbel § to f length of head ; maxillary barbel as long as 

 or a little longer than head, reaching middle or end of pectoral fin ; 

 inner mandibular barbel \ to § length of head, about f length of outer. 

 Gill-rakers on first arch not closely set, 12 to 15 in number. Clavicles 

 concealed under the skin. Dorsal 66-72, its distance from occipital 

 process about \ length of head, narrowly separated from caudal. Anal 

 49-55. Pectoral \ to f length of head, the spine serrated on both 



VOL. II. S 



