THE SNAIL 



75 



Fig. 17 



A dissection oi Helix aspersa frum ihe dorsal surface. The roof of the mantle- 

 cavity has been cut through near the collar and thrown back ; the generative 

 organs are displayed on the left, and the alimentary tract on the right of the 

 figure, al, albumen gland ; an., anus ; aji, auricle ; Iw., blood-vessels in 

 mantle; t?^, cerebral ganglion ; cr, crop; <■('//, globular dilatation on sperma" 

 theca ; dvv, diverticulum of sperniatheca ; Ds, dart sac ; ^/, glandular part 

 of excretory organ ; hd, hermaphrodite duct ; ^, flagelium of penis ; m/, 

 intestine ; //, liver ; Mg., mucous glands ; od., ovlducal portion of conjoined 

 genital duct; ov., oviduct; oi, ovotestis ; /*, penis; fie, pericardium; fih, 

 pharynx ; R, rectum ; sal, salivary glands ; sd, duct of salivary gland ; sfid, 

 spermiducal portion of conjoined genital duct ; sfith, spermatheca ; wr, 

 ureter ; v, ventricle of heart; vd, vas deferens. 



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