27 



Mactra solidissima. Common at Nahant and on other 

 beaches. A very nngulaYvarleiy occurs at Farmer's beach, 

 Svvampscot, near Marblehead. 



Mactra ovaUs* (young.) 



Mesodesma arctata. (Young.) Nahant beach. 



Kellia rubra. Lynn harbor. 



Saxicava distorta. Common in the crevices of isolated 

 rocks, along shore at half tide and below. 



Petricola pholadiformis. Common. 



Sanguinolaria fusca. Common. 

 Sanguinolaria sordida. Rare. 



Tellina tenera. Common. 



Tellina tenta.* Small specimens are common, in fishes 

 taken near Scituate, (South Shore) ; also, off Marblehead; 

 and not unfrequently an adult specimen may be found in 

 fishes' maws. 



Lucina radula. Single valves at Nahant beach, and at 

 Pound beach. 



Lucina flexuosa.* Common; from off Scituate. 



Cyclas partumeia. Common in a shaded ditch at 

 Swampscot 



Cyclas sp? A few specimens in a small meadow on the 

 high land in rear of the village of Swampscot. 



Astarte castanea. Occasionally a specimen is found at 

 Nahant beach. 



Astarte sulcata.* (Young.) Adult, single valves. In 

 Lynn harbor. 



Astarte quadrans.^ Rather common. 



Cyprina Islandica. ^Very common. 



Cytherea convexa. At Nahant beach, but rare, 



Venus mercenaria. I have found four or five living spe- 

 cimens at Pound beach. 

 Yenus gemma. Common in Lynn harbor. 



Cardium pinnatulum.^= In all parts of the Bay ; very 

 common ; also, taken by a dredge near Swampscot, 

 Cardium Islandicum.* Frequent. 



