260 



THE ELASMOBRANCH FISHES 



Fig. 227. Cephalic canals and ampullae of Lorenzini, Heptanclms maculaUis. (G. L. TIanner, 

 orig.) A. Dorsal view. B. Ventral view. 



cc, suprateniporal canal; e.d., endolymphatic duct; lime, hyomandibular canal; iha., 

 inner buccal ampullae; ioc, infraorbital canal; isa., infraspiracular ampullae; IL, lateral 

 line; mg., mandibular groove; mpo., pit organs in gular line (gl.) ] n.ap., nasal aperture; 

 oba.^'-, outer buccal and posterior outer buccal ampullae; soa., supraophthalmic ampullae; 

 soc, supraorbital canal ; sp., spiracle. 



