256 



SILURID.E. 



24. CLARIAS MACROMYSTAX. 

 Giinth. Gat. Fish. v. p. 17 (1864) ; Bouleng. Proc. Zool. Soc. 1907, p. 1084, fig. 

 Depth of body 6^ times in total length, length of head 4 times. 

 Head 1J as long as broad, finely granulate above ; occipital process 

 angular ; frontal fontanelle oval, not quite twice as long as broad ; 

 occipital fontanelle smaller, in advance of occipital process ; eye small, 

 its diameter 3 times in length of snout, 5J times in interorbital 

 width, which equals width of mouth and f length of head ; band of 

 prsemaxillary teeth only 3 times as long as broad ; vomerine teeth 



Fig. 212. 



Clarias maeromystax 

 Type (P. Z. S. 1907). 



mostly granular, forming a large fan-shaped patch the 

 longitudinal diameter of which exceeds the width of the 

 prgemaxillary band ; nasal barbel as long as head ; maxillary barbel ] \ 

 length of head, reaching nearly to base of ventral ; inner mandibular 

 barbel nearly as long as nasal, § length of outer. Gill-rakers on 

 first arch not closely set, 16 in number. Clavicles exposed, striated. 

 Dorsal 80, its distance from occipital process J length of head, very 

 narrowly separated from caudal. Anal 63, very narrowly separated 

 from caudal. Pectoral \ length of head, the spine strongly serrated 



