540 Annals of the Carnegie Museum. 



On the islands under cultivation, and particularly on West Sister 

 Island, which was overrun by large flocks of turkeys, living moUusks 

 were very scarce, while the dead shells indicated that at one time the 

 molluscan population was very large, the ground being covered by 

 the "bones." It is my belief that this destruction is largely due to 

 the turkeys, which scratch up and eat the eggs. Of course the con- 

 stant tramping of cattle and the destruction of the undergrowth by 

 browsing would destroy large numbers, but the turkeys scratch all 

 around, and even under the fallen trees, where the eggs would be 

 deposited. 



A number of dead shells were gathered on West Sister Island, and 

 on cleaning out the dirt with which they were filled many minute 

 species were found. Three of the dead specimens of solitaria contained 

 young of from two to two and one-half whorls, there being two young 

 in one of the shells and one in each of the others. Out of others 

 broken young were shaken, but so badly broken that they were merely 

 recognizable as the young of solitaria. Does this indicate that, at 

 times, solitaria may be viviparous? 



Explanation of Plate XXXII. 



Fig. I. Pyramidula solitaria strcntiana Clapp. (Type) < 



Fig. 2. Pyramidula solitaria strontiana Clapp, most elevated form. 



Fig. 3. Pyramidula solitaria strontiana Clapp, largest specimen. 



Figs. 4-5. Pyramidula solitaria roseo-apicata Clapp. (Type) 



Fig. 6. Pyramidula solitaria roseo-apicata Clapp, back view. 



Figs. 7-8. Pyramidula solitaria mynesites Clapp. (Type) 



Figs. 9-10. Pyramidula alternata eriensis Clapp. (Type) 



Fig. II. Py^'aw ji?f /a aiierwa^a meM«5 Clapp, very tall specimen. 



Fig. 12. Pyramidula alternata eriensis Clapp, top view of largest specimen. 



Figs. 13-14. Polygyra profunda strontiatta Clapp. (Type) 



Fig. 15. " Polygyra profunda strontiana Clapp, showing extreme elevation of 



spire. 

 Figs. 16-17. Polygyra albolabris goodrichi Clapp. (Type) 

 Fig. 18. Polygyra albolabris goodrichi Clapp, showing extreme height of spire. 



