138 THE NAUTILUS!. 



27. Helicodiscus lineatus Say. Common. 



28. Punctum minutissitmim Lea. Common. 



29. Mesodon thyroides Say. Common. 



30. Mesodon albolabri:> Say. Very common. 

 \ o'Sl. Mesodon dentif'erum Binn. Rare. 



32. Mesodon sayii Binn. Uncommon. 



33. Stenotrema hirsuta Say. Very common. 



34. Stenotrema monodon Rack. Very common. 



35. Triodopsis tridentata Say. Very common. 



36. Triodopsis palliata Say. Frequent. 



37. Vallonia pulchella JNIull. Very common. 



38. Strobila labyrinthica Say. Uncommon. 



39. Pujia corticai'ia Say. Frequent. 

 -740. Pupa rupicola Say. Uncommon. 



41. Pupa arrnifera Say. Common. 



42. Pupa contracta Say. Comtnon. 

 ^3. Pupa simplex Gld. Rare. 



44. Pupa milium Gld. Uncommon. 



45. Vertigo ovata Say. Uncommon. 



46. Vertigo gouldii Binn. Frequent. 



47. Vertigo boliesiana Morse. Uncommon. 



48. Vertigo pentodon Say. Frequent. 



49. Ferrussacia subcylindrica Linn. Frequent. 



50. Succinea avara Say. Rare. 



51. Succinea obliqua Say. Common. 



52. Succinea ovalis Gld. Frequent. 



53. Carychium exiguum Say. Rare. 



I include Carychium on the list because I have always found 

 it, though in damp places, quite removed from bodies of water. It 

 was usually found on the roots of various plants that grew in damp 

 places. The Succinea avara was found but once, and not far from 

 water; the S. ovalis usually near the lake shore. Ferrussacia was 

 frequent under leaves in very damp places. V. pentodon was the 

 most common Vertigo, often on the exposed roots of cedar. Pupa 

 simplex was found but once, and in a very wet locality. P. con- 

 tracta and arrnifera were common in various places ; but P. con- 

 tracta was found in more places than P. armijera. P. corticaria 

 was always seen on trees. Strobila was found in places where P. 

 arrnifera and contracta were common and E. midtidenfata was occa- 

 sional. F«^/owmj9M^c7ie//a could be found both in wet places and 

 under dry stones, high up on hills. Triodopsis tridentata was 

 everywhere but T. palliata was usually found in damp and shady 

 glens. S. hirsuta and monodon anywhere under stones and pieces 

 of wood. Mesodon albolabris was larger on the hillsides than in 

 the valleys. In some small localities M. thyroides was more com- 



