80 THE NAUTILUS. 



A OOOD COLLECTING OB0XJI7D FOB SHALL SHELLS. 



BY W. F, CLAPP. 



The shells listed below were gathered at High Pines, Duxbury 

 Beach, Mass. High Pines is a small hummock, separated from the 

 mainland and any vegetation by eight miles of beach and sand 

 dunes. The hummock itself which is only an acre in area, is cov- 

 ered with a dense growth of scrub oak, beach plum and sumac. 



Considering the above conditions, it is interesting to note the 

 quantity of specimens obtained from one square yard. I have in- 

 cluded in the list approximately the number of specimens of each 

 species found. Several of the species listed I have been unable to 

 find in Duxbury on the mainland, and, on the other hand, species 

 found in considerable quantities in Duxbury do not appear to inhabit 

 High Pines. 



On old charts of Duxbury Beach, the area connecting High Pines 

 with the mainland appears as thickly wooded, but storms have re- 

 moved all visible evidences of the former vegetation. 



" For the benefit of those from Missouri," 1 will add, that I have 

 a small quantity of soil similar to that from which these shells were 

 taken, and will be pleased to divide the spoils with anyone caring to 

 sort out the remainder, and thus verify my figures. 



Vallonia pulcheUa Miiller 1800 



Zoogenites harpa Say 770 



Pupilla muscorum Linn 450 



Zonitoides arhorea Say 270 



Cochlicopa luhrica Miill 150 



Helicodiscus parallelus Say 75 



Helix hortensis Miiller 25 



Vertigo milium Gould 60 



Vitrea hammonis Strom 28 



Bifidaria curvidens Gould 24 



Punctum pygmaeum Drap 23 



Succinea ovalis totteniana Lea 17 



Pyramidula cronkhitei anthonyi Pils 2 



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