EEFORMATION OF THE CRYSTALLINE STYLE 



265 



clam beds with fresh water from an adjacent tributary of the 

 Siuslaw River for periods of several weeks had, I believe, its effect 

 upon the death rate at this time. Moreover, during the fall and 

 winter months Mya arenaria is not in the best physical condi- 



^-•■- ,_ 



Fig. 1 Semidiagrammatic sketch of Mya arenaria showing the relation of the 

 •crystalline style to the digestive tract. St. stomach; Ss, style sac; Int, intestine. 

 X I 



Fig. 2 Semidiagrammatic sketch showing the position of the crystalline style 

 in the visceral mass. &, style sac. X I5. 



Fig. 3 Ventral vjew of the visceral mass with the exposed portion of the style 

 sac. The usual point of severance of the style sac is indicated by the transverse 

 constriction. Ss, style sac. X I5. 



