488 



AUGUSTA LA MONT ON 



ampullae (texl figs. 7 and 9). On its way it sends off a series of slender branches to the 

 \ i'u t nil portion of the infra-orbital canal, and after supplying the ampullae, proceeds 

 to the tip of the snout for the further supply of the same sensory canal. Where 

 the inner buccal ampullae are enclosed by a capsule, as shown in the accompanying 



i .... 



y 



y 



Q 



/ 



/ 



Text-fig. 9. — Ventral dissection of nerve-supply of ampullae, R. circularis, natural size. 

 G. Gills. Other lettering as in text-fig. 7. 



sketch of a dissection of Raia batis (text-fig. 7), both the branches mentioned 

 pass through it before breaking up for the supply of the individual ampullae. In 

 R. clavata the condition represented in text-fig. 3 was observed. The two branches 

 — much longer than those of R. batis — supplied each a separate little cluster of 

 ampullae. The ophthalmic ampullae lay between, though a little anterior to these two 

 clusters, and in close contact with them, and, since there were no enclosing capsules, 



