GILBERT VAN INGEN. 163 
Patula striatella, Anthony.— Under bark, rotten logs 
and leaf mould in cold, wet places: not common. 
Glen at Vassar College. 
Patula Asteriscus, Morse.—In leaf mould in cold 
Swamps: rare. 
Three specimens have been found in ‘‘ The Glen”’ at 
Vassar College. 
Gen. Helicodiscus. 
Helicodiscus lineatus, Say.—Stony soil: common. 
Gen. Punctum. 
Punctum pygmaeum minutissimum, Lea.—Stony soil: 
not common. James’ Woods; Glen at Vassar Col- 
lege; Bech’s Woods. 
Gen. Mesodon. 
Mesodon thyroides, Say.—Rich, shady woods: common. 
Very abundant about Winslow’s marl pond, three- 
quarters ofa mile south of the Asylum. 
M. thyroides bucculenta, Gld.—Leaf mould: not com- 
mon. Glen at Vassar College. 
M. albolabris, Say.—Hillsides: common. Prefers stony 
soil. 
Gen. Stenotrema. 
Stenotrema hirsutum, Say.—Under stones and in leaf 
mould : common. 
Stenotrema monodon, Rack.—-Under logs and stones : 
not common. 
Stenotrema monodon, fraterna Say.—Under logs and 
stones: not common. 
Gen. Triodopsis. 
Triodopsis tridentata, Suy.—Under stones in rich woods: 
common. 
Gen. Vallonia. 
Vallonia puilchella, Mill.—Under stones, logs and 
boards ; in places very abundant. 
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