86 E. P. CHURCHILL, JR. 



PLATE III. 



FIG. 12. a, mesenchyme cells and b, blood corpuscles of juv. A. imbecillis after 

 remaining in fat solution 10 days. 



FIG. 13 a and b. Mesenchyme cells and corpuscles of the control kept in filtered 

 water. 



FIG. 1 6. Epithelial cells of intestine of juv. Q. pustulosa after remaining in fat 

 solution 24 hours. 



FIG. 17. Portion of foot of same individual as in Fig. 16. 



FIGS. 18 AND 19. Gill filaments of same individual as in Fig. 16. 



FIG. 20. Portion of side of mantle next to body of same individual as in Fig. 16. 



FIG. 21. a. Epithelial cells of that portion of mantle immersed in fat solution 

 22 hours. The mouth of this mussel was kept above the solution, b. Epithelial 

 cells of corresponding part of mantle of mussel used as control for Fig. 210. 



