172 A NATURE WOOING. 



fuse heap near their dwelling, there to remain 

 for centuries, and when uncovered to serve as 

 a source of speculation for some visiting nat- 

 uralist. 



12. Glandina truncata Gmel. A few specimens of 



the shells of this common land snail were 

 found scattered here and there among the 

 shell layers of the mound. It is possible that 

 they found their own way there during the 

 time of its formation. 



13. Planorbis glabratus Say. Several examples of 



this fresh-water mollusk were secured by Pro- 

 fessor Hitchcock. It is quite common in the 

 ponds about Ormond, and ranges throughout 

 the southeastern United States. 



BIVALVES. 



14. Tagelus gibbus Speng. A single valve of this 



representative of the razor-clam group was 

 found in the lower third of the mound. It 

 ranges from Cape Cod to Trinidad. 



15. Donax variabilis Say. This "coquina clam" 



forms by far the greater part of the mound. 



16. Venus mercenaria Linn. Two or three deposits, 



comprising a half bushel or so each, of the 

 shells of this round clam were found in the 

 uppermost third. 



17. Cardium magnum Born. A few valves, mostly 



broken, were found in several of the shell lay- 



