**-1l.(L7tL 



au.c. 



-~sp.c. 



Plate XVIII. — A dissection of the nervous system and sense organs 

 of the dogfish. 



On the left : nerves labelled as in Figs. 262-266. 



On the right: a.c.s., anterior cardinal sinus; a.v.s. t amp,, h.s., p.v.s., utr. t parts 

 of labyrinth, labelled as in Fig. 42 ; au.c, auditory capsule; cer. t olf.o. t ol/J. t sp.c. t 

 as in Fig. 262 ; n.ant., neuromast ampulla; ; o.s. t r.e., r.int., r.s. t sp, i 2&m Fig. 265. 



