PLATE VIII. 
Showing the muscles of the foot and body. 
The same letters apply to the same organs on each of the figures. 
Fies. 1, 2, 3. 
a, a. Anterior adductor muscle. g. Gills. 
a. ry. Anterior retractor muscle. p- Pericardium. 
p. a. Posterior adductor muscle. au. Auricle. 
p. r. Posterior retractor muscle. v. Ventricle. 
p. p. Protractor pedis muscle. 
