MOLLUSCA-^THE ALIMENTARY CANAL 



193 



3. Scaphopoda. 



The mid-gut of Dental imn (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, Jbjuth ; ?», Ipaf-like oral tentacle.s ; c, snout ; d, 

 entrance to pharynx; r, pharynx with radula, /,■ g, liind-gut; /), right kidney ; i, anus; I; riglit 

 nepliridial aperture ; / and q, ducts of the dige.stive gland, n ; m and o, gonad ; n and p, digestive 

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

 on which the filamentous tentacles are phaced. 



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

 VOL. II O 



