St 



Margarita cinerea.* ? >^ _„^ 

 ■MI -, V. : [ Common. 



IVIargarita obscnra. ) 



Margarita luidulata.* Very common; taken alive from 

 rocky bottom in six fathoms water, off Swampscot. 



Margarita arctica. Some fiiie specimens occurred in the 

 pools on the rocks, left by the tide, at Sand Point, Lynn 

 harbor; also, on the marine vegetation about the rocks at 

 low water mark on the Eastern side of Little Nahant ; and 

 likewise in a similar locality at Dread Ledge, Swampscot. 



Margarita argentata.* Sparingly near the shores of Mar- 

 blehead and of Swampscot. 



Littorina rudis. Abundant about the rocks on the ocean 

 shore. 



Littorina tenebrosa. Abundant among the coarse grasses, 

 which grow on the sides of the ditches in the Lynn 

 marshes. 



Littorina palliata. Exceedingly common on all parts of 

 the rocky shores of the sea ; as are likewise all the varieties 

 of this species. 



Lacuna neritoidea. Found alive, but sparingly, among 

 the rocks at the eastern end of Pound beach, Swampscot, 



Lacuna vincta and the variety /i^sca. On the kelps and 

 larger algos in water varying from three to eight fathoms 

 depth ; also, on the rocks at low water. 



Cingula minuta. Very abundant at Lynn harbor, 

 Cingula aculeus. On the empty shells of Modiola modi- 

 olus, lodged in the crevices of the rocks at half tide, Swamp- 

 scot. 



Turritella erosa.* Rather common. 



Turritella acicula.* (Stimpson.) A single specimen. 



Pyramis striatula. From both shores of the Bay, but 

 rare. 



Odostomia exigua. Common about loose stones at Lynn 

 harbor. I have found this species very abundant on the 

 stump of a tree, which is five feet below high water mark, 

 and which lies on the border of the flats on the west side of 

 Lynn harbor. There are many such stumps in that imme- 

 diate neighborhood, and usually, they are almost covered 

 with the mud of the flats. 



Pleurotoma decussata.* Rare. 



