PLATE VIII. 



Showing the muscles of the foot and body. 

 The same letters apply to the same organs on each of the figures 





Figs. : 



L, 2, 3. 





a. a. 



Anterior adductor muscle. 



g- 



Gills. 



a. r. 



Anterior retractor muscle. 



P- 



Pericardium, 



p. a. 



Posterior adductor muscle. 



au. 



Auricle. 



p. r. 



Posterior retractor muscle. 



v. 



Ventricle. 



p.p. 



Protractor pedis muscle. 







