202 



W. JJpham — Recent Fossils near Boston. 



tide level, above which the mean height of the tide, both in 

 the Charles River and in Boston Harbor, is ten feet. 



The most abundant species here, occurring in great numbers 

 and of large size, are Mya arenaria, Venus mereenaria, 

 Pecten irradians, and Ostrea Virginiana. Some of the shells 

 of the long clam {Mya) measure five inches in length and 

 three inches in width. A small oyster shell in this bed is 

 exceptional, the usual length being eight inches, with a width 

 of two to three inches ; while many are ten inches long, and 

 one valve has a thickness of one and a half inches. 



Table of Recent Fossils 



, Boston, Mass. 





Muddy 



Charles 



City 





Species. 



River. 



River. 



Point. 



Present geographic range. 



Balanus balanoides Stimpson. 



* 







Shores of whole North At- 

 lantic. 



Tritia trivittata Adams. 



* 



* 



* 



Fla. to G. of St. Lawrence. 



Ilyanassa obsolela Stimpson. 





* 



* 



G. of Mex. to Cape Cod; 

 local north to G. of St. 

 Lawrence. 



Urosalpinx cinerea Stimpson. 



* 



* 



* 



Same as preceding. 



Purpura lapillus Lam. 







•» 



E. end of Long Island to 

 Arctic Ocean. 



Anachis avara Perkins. 





* 





G. of Mex. to Mass. Bay. 



Lunatia lieros Adams. 



* 



*K 



* 



Ga. to S. Labrador. 



Crepidula fomicata Lam. 







* 



G. of Mex. to Mass. Bay ; 

 local north to G. of St. L. 



Crepidula plana Say. 







* 



Same as preceding. 



Littorina rudis Gould. 



* 







N. J. to Arctic Ocean. 



Utriculus canaliculars Stimpson. 



* 







S. C. to Mass. Bay. 



Mya arenaria L. 



* 



* 



* 



S. C. to Arctic Ocean. 



Tagelus gibbus Gray. 







* 



W. Indies and G. of Mex. to 

 Cape Cod. 



Macoma fragilis Adams. 



* 



* 



# 



Ga. to Greenland. 



Ma.ctra solidAssima Chemnitz. 







* 



Texas to Labrador. 



Mulinia lateralis Gray. 



* 



* 



* 



Texas to Mass. Bay. 



Venus mercenaria L. 



* 



* 



* 



Fla. to Mass. Bay ; local 

 north to G. of St. L. 



Lmvicardium Mortoni Perkins. 







* 



G. of Mex. to Cape Cod ; local 

 north to N. S. 



Astarte undata Gould. 







* 



L. I. Sound to G. of St. Law- 

 rence. 



Lucina filosa Stimpson. 







* 



Conn, to Maine. 



Modiola plicatula Lam. 



* 



* 



* 



Ga. to Casco Bay, Maine ; 

 local north to G. of St. L. 



Pecten irradians Lam. 





* 



* 



G. of Mex. to Cape Cod ; 

 local north to N. S. 



Pecten tenuicoslatus Mighels. 







* 



N. J. to Labrador. 



Anomia glabra Verrill. 







* 



Fla. to Cape Cod ; local north 

 to Cape Sable, N. S. 



Ostrea Virginiana Lister. 



* 



* 



# 



G. of Mex. to Cape Cod ; 

 local N. to Bay of Chaleurs, 

 G. of St. L. 



