26 



Anatifa sp. ? A single specimen from the slicll of a lob- 

 ster. 



Cineras vittata ; some fine, large specimens were taken 

 from a Sun-fish (^Ortliagorlsciis mola. JAn^ to wliich they 

 were firmly; attached in company with a crustacean {l^tn- 

 ella Jilosa Guv.) 



Teredo dilatata. Stimpson. 



Pholas crispata. 



Pholas costata, Lin. ? A single valve, which I suppose to 

 be this specieSj was picked np at Nahant beach. 



Solen ensis. Very abundant. 



Machajra costata. Very abundant. 



Solemya velum, Lynn harbor. Common. 

 Solemya borealis. Nahant beach. Rare. 



Glycemeris siliqua. I found several, after a storm in 

 the month of April, 1851, on Nahant beach : they are abun- 

 dant at Middle Bank, Massachusetts Bay. 



Mya arenaria. 



Mya truncata. Rare. 



Corbulasp? Some specimens are occasionally found at 

 King's beach, which I suppose to belong to C. contracla. 



Pandora trilineata. Single valves at Point or Pound 

 beach. 



Osteodesma hyalina. Lynn harbor. 



Anatina papyracea,* not abundant. 



Cochlodesma Leana. Occasionally found at Nahant 

 Beach after storms. 



Thracia Conradi. It is very rarely that a good specimen 

 of this shell can be obtained. 



Thracia Couthouyi* (Stimpson) is occasionally met with 

 in fishes taken along the "South shore." It certainly is not 

 abundant, although probably it is widely distributed. 



Thracia truncata.^ I have found in all, perhaps six 

 specimens, in the course of as many years. 



