254 



COLLEGE ZOOLOGY 



13 



12 



21 



--28 



25 



23 



FIG. 181. Diagram showing the anatomy of a snail, Helix pomatia. 

 /, pharynx; 2, oesophagus; 3, salivary glands; j, stomach; 5, liver; 6, rectum; 

 7, anus; 8, kidney; Q, ureter; 10, opening of ureter; n, ventricle; 12, auricle; 

 13, pulmonary vein; 14, opening of nephridium into pericardium; 75, ovo- 

 testis; 16, common duct of ovotestis; 17, albumen gland; iS, female duct; 

 IQ, male duct; 20, spermatheca; 21, flagellum; 22, accessory glands; 23, penis; 

 24, dart sac; 25, vagina; 26, eye tentacle retracted; 27, anterior tentacle 

 retracted; 28, muscle which retracts head, pharynx, tentacle, etc. (From 

 Shipley and MacBride, after Hatschek and Cori.) 



