GROWTH AND AGE AT MATUEITY OF THE PACIFIC RAZOR CLAM 
205 
Fig. 4. — Razor clam. View of left side, with shell and mantle removed. Aa, anterior adductor. Es, 
exhalent siphon. F, foot. Is, inhalent siphon. O, gill. H, hinge. M, mantle. Mf, mantle fold. 
P, palp. Pa, posterior adductor. S, siphon. Sh, shell. T, papillse. U, umbo 
