262 



COMPARATIVE ANATOMY 



C 



uso 



FIG. 191. A, VENTRAL VIEW OF THE HEAD OK A DOGFISH (Scyl/iitm cnni<:ul). 

 HSO, integumentary sense-organs ; M, month ; N, nostril. 



B, LATERAL VIEW OF THE HEAD OF A PIKE (Exo.c Inciux). Ay, eye ; a and l>, the 

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

 separating them. 



FIG. 191. C, LATERAL VIEW OF THE HEAD OF Mura'tin ln/<ita. 



A, eye ; HSO, integumentary sense-organs : Vli and HR, anterior and posterior 



narial tubes. 



