28 



Cardium GrcBnlandicum.* (Young.) A single speci- 

 men from off Scituate. 



Cardita borealis.* Not uncommon. 



Nncula thraciscformis.* Off Scituate ; very rare. 1 

 have found but three specimens. 

 Nncula limatula.* 1 



Not common. 



Nncula minuta.* 



Nucula myalis.* 



Nncula sapotilla.* J 



Nucula proxima.* ) n .u 



Nncula lenuis.* \ ^^^^er common. 



Unio complanatus. Very common at the Floating-bridge 

 pond, Lynn. 



Anodon fluviatilis. Flax-pond, Lynn. 



Mytilus edulis and the variety, pellucidiis. Abundant. 



Modiola modiolus. Often found attached to the rocks at 

 low water ; also, drawn to shore by the marine algec in 

 storms. 



Modiola plicatula. Lynn salt marshes. 



Modiola discrepans.* Rare. 



Modiola nexa.* Very rare. 



Modiola discors.* Rare. 



Modiola glandula.* Common. 



Ostrea sp ? Large numbers of dead oyster-shells, thrown 

 up from the deep water, may be found after storms at Na- 

 hant beach. They are a long and narrow variety. 



Anomia ephippium. Rather common. 



Terebratula caput serpentis. Not uncommon on stones 

 which have been drawn from the deeper water, "off shore." 



Chiton marmoreus (O.) Stimpson. A single specimen 

 from an anchor stock in five fathoms, sand ; at New 

 Cove, Swampscot. 



Chiton fulminatus.* Common. 



Chiton ruber.* Common. 



Chiton albus.* Rare. 



Chiton Emersonianus.* Not rare. 



Lottia testudinalis. Very common. 



