194 



k^uccinca. 



S. campestris. Foiitirl among dead leaves and under 

 loose stones. 



S. ovalis. Found on the edges of ditches and under 

 stones. 



►S. avara. Found under loose leaves in damp places. 



Pupa. 



P. contracta. 



P. modesta. 



P. curvidens. V- All these Pupge have been found 



P. exigua. near Great Swamp-Meadow in Salem. 



P. milium. 



P. simplex. An amphibious species. I have found it 

 crawling on the bottom of a brook and under dry leaves, 

 and loose stones. 



Auricula. 

 A. denticula. Found near City Mills. 

 A. bidentata. I have found them crawling in depressions 

 in salt marsh, where the tide has left them. 



Planorbis. 

 P. lentus. Plenty in fresh water ditches. 

 P. campanulatus. Plenty at Leggs-hill Pond. 

 P. armigerus. In brooks in Great Pasture. 

 P. bicarinatus. In all the ponds about Salem. 

 P. hirsutus. In Leggs-hill pond and in Flax pond. 

 P. deflectus. In Flax pond. 

 P. exacutus. In Leggs-hill pond. 



P. elevatus. In brooks and ponds. Planorbis parvus of 

 Dr. Gould, is the young of this species. 



Physa. 

 P. heterostropha. Found in running brooks. 

 P. ancillaria. Found in still ponds. 

 P. elongata. Found in Leggs-hill pond. 



Ancylus. 

 A. fuscus. Fine specimen in Floating-bridge pond. 

 A. sp: A minute form from ditch in Great-swamp JMcad- 

 ow. 



Valvata. 

 V. pupoidea. At Leggs-hill pond. 



