VII 



MOLLUSCATHE ALIMENTARY CANAL 



193 



3. Scaphopoda. 



The mid-gilt of Dentalium (Fig. 165) consists of a looped stomachal tube bent 



FIG. 165. Alimentary canal, kidney, and sexual organs of Dentalium, from behind (after 

 Lacaze-Duthiers and Leuckart combined), a, Mouth ; 5, leaf-like oral tentacles ; c, snout ; d, 

 entrance to pharynx; e, pharynx with radula, /, g, hind-gut; /;, right kidney; i, anus; k, right 

 nephridial aperture ; I and q, ducts of the digestive gland, n ; m and o, gonad ; n and p, digestive 

 gland (liver) ; r, left nephridial aperture ; s, left kidney ; t, stomach ; u, pharynx ; v, lobes or sails 

 on which the filamentous tentacles are placed. 



back on itself, and of a small intestine lying in a tangled coil behind the resophagus. 

 VOL. II O 



