SPIRE 



BODY VJHORL' 



APEX 



OPERCULUM 



(REMOVED) 



S UT U RE 



GROWTH LINES IM EPIDERMIS 



PARIETAL WALL 



U M B I L I C U S 



BASE OF COLUM ELLA 



L I P 



DlACrRAn OF A SNAIL SHELL 



TENTACLES 

 C- E N \ TAL PORE 

 MANTLE 

 RE S P \ R ATOPvY PORE 



BODY 



FOOT 



CAUDAL (MUCOUS PORE 



OlACrRAM OF A SLUCr 



113 



