262 



COMPARATIVE ANATOMY 



H7? 



ESO 



FIG. 191. A, VENTRAL VIEW OF THE HEAD OF A DOGFISH (Scyllium canicula). 

 HtfO, integumentary sense-organs ; J/, mouth ; N, nostril. 



, LATERAL VIEW OF THE HEAD OF A PIKE (Esox Indus). Ay, eye ; a and h, the 

 anterior and posterior openings of the external nostrils, and f, fold of skin 

 separating them. 



FIG. 191. C, LATERAL VIEW OF THE HEAD OF Mimnna htltna. 



A y eye ; HSO, integumentary sense-organs ; VR and HR, anterior and posterior 



narial tubes. 



