REFORMATION OF THE CRYSTALLINE STYLE 283 



The stomachs and intestines of these animals were empty, the latter 

 exhibiting a blanched appearance indicative of the lack of activity for 

 a considerable length of time. It was evident that the ingestion of food 

 had been completely inhibited during the entire twenty-six days. All 

 surviving animals were in a very weakened condition. 



Experiment 5. Decemher 27, 1918 



Thirty-seven clams with styles removed as in previous experiments 

 were returned to the natural bed. This test extended over a period of 

 thirty-four days. 



Result, January 30, 1919. Five clams survived the operation for 

 thirty-four days. On examining these animals it was found that each 

 had reformed a very rudimentary crystalline style. In each case the 

 organ rested on the right tj^phlosole, occupying nearly the entire length 

 of the proximal division of the style sac, but not projecting into the 

 stomach. It was convoluted and coiled throughout its course (fig. 

 25). A delicate food core formed the axis of the rudimentary style. 

 During the period of thirty-four days these crystalline styles had reached 

 a stage of development in all respects comparable to those formed be- 

 tween September 19, and September 25, or during a period of six days. 



No food was found in the stomach or intestines of any of these clams 

 surviving the period of thirty-four days. The condition of the intesti- 

 nal tube was as has been described in the preceding experiment, and the 

 animals were in a very weakened condition. 



Experiment 6. September 25, 1918 



Twelve clams with crystalline styles removed as in preceding experi- 

 ments were replaced under normal conditions. The experiment ex- 

 tended over a period of fifty-two days. 



Result, November 16, 1918. Four of the clams were alive and ap- 

 parently in good condition on this date. A crystalline style was re- 

 formed and fairly wtII developed in each of the surviving animals (fig. 

 26). The style occupied the entire length of the proximal division of 

 the style sac and projected well into the stomach, although not in actual 

 contact with the gastric shield. Beginning with the distal extremity, 

 about two-thirds of the length of the crystalline style was coiled to the 

 right when viewed from the proximal end, while the proximal third 

 was smooth. The short, blind division of the style sac in each of the 

 animals was closed and either filled with mud or empty. 



Both the stomach and intestines in each of these clams were well 

 filled with food, indicating the functioning of the digestive organs in a 

 normal manner. 



Allen ('14), with reference to the feeding habits of molluscs, 

 concludes: ''that appetite fulfills its function by the control of 



