C YPRINIFORMES 



pob-.. 



_--/'■ 



—~Ptf 



--plo 



pst-- 



Skull and anterior vertebrae of Clarias magur, H. B. A dotted line indicates the course of 

 1 he lateral line according to Pollard, an, anterior suborbital ; b, barbel ; ch, lateral cheek-bone, 

 possibly preopercular?; eth, ethmoid ; fr, frontal, possibly including- parietals ; mx, maxilla ; 

 an, nasal ; pmx, premaxilla ; poh, postorbital ; prf, prefrontal ; pst, post-temporal ; ptf, post- 

 frontal ; pto, pterotic ; so, suborbital ; soc, supraoccipital, possibly including parietals ; v, 

 expanded processes of anterior vertebrae, partially enclosing anterior chambers of air-bladder. 



an 



Left-side view of head of Clarias lazera, C. and V., with branchial chamber exposed by 

 removal of operculum, a, accessory respiiatory organs attached to top of gill-arches; an, 

 anterior nostril ; 6, barbel ; br, gill-lamellae ; pn, posterior nostril. 



