94 Cincinnati Society of Natural History. 



52. Pupa or Leucochila contracta, Say, 54, 55, 56, 57. 



Like No. 49, but smaller, mouth more triangular. Rocky places. 

 A larger variety occurs in woods. 



53. Pupa or Leucochila, corticaria, Say. 



Like No. 52, but only one tooth on pillar lip. Under bark of 

 half decayed logs. 



54. Pupa or Leucochila, pentodon, Say, 55, 56, 57. 



White, smaller than No. 52, peristome expanded but not reflexed, 

 one tooth on parietal wall, four or more on outer lip. Rocky 

 places. 



Genus Vertigo, (Mull.) 



55. Vertigo milium, Gould, 56, 57. 



Like No. 54, but brown, very small. Beds of leaves. 



56. Vertigo ovata, Say. 



Like No. 55, larger and more darkly brown. Beds of leaves. 



57. Vertigo simplex, Gould. 



Like No. 55, but no teeth. Beds of leaves. 



FAMILY SUCCINITE. 



GENUS SUCCINEA. 



58. Succinea avara, Say, 59, 60, 61, 



Pale reddish yellow, heght *4 inch. River banks. 



59. Succinea ovalis, Gld. 



Longer and broader at base than No. 58. 



60. Succinea vermeta, 61 . 



Light colored, smaller variety of No. 58. 



61. Succinea aurea, Lea. 



Like No. 60 but of a more highly golden color. River banks. 



62. Succinea obliqua, Say. 



Light yellowish green, height ^-inch. River banks. 



SUB-ORDER. LIMNOPHILA. 

 Family AuriculiDjE. 

 genus carychium. 



63. Carychium exiguum, Say. 



Very thin and small, elongated, white transparent, small tooth on 

 columella. 



