652 - Heredity and Evolution 



Aoidues r««J»wv, 'Si 



OCTOPUS 



TOOTH SHELL 



Fig. 32-29. The five classes of mollusks display a wide variation of form, 

 neura (Chiton); three of the Pelecypoda (clam, oyster, and scallop); one of 

 of the Gastropoda (whelk); and three of the Cephalopoda 



This picture shows: one of the Amphi- 

 the Scaphopoda (the tooth shell); one 



