Catalogue of Land and Fresh Water Shells. 



93 



Genus Helicodiscus {Morse.) 



44. Helicodiscus lineatus, Say. 



Small disk, fine longitudinal lines on outer whirl, two pairs of 

 teeth within peristome. On dead wood. 



Genus Macrocyclis {Beck.) 



45. Macrocyclis concava, Say. 



W. pale, wide umbilicus, lip slightly thickened. Found 

 everywhere. 



Genus Strobila. 



46. Strobila labyrinthica, Say. 



Like No. 38, but more conical, small tooth on peristome and 

 long tooth running far into the shell, open umbilicus, brown, 

 ribbed and lipped. Under bark of half decayed logs. 



Genus Punctum, {Morse.) 



47. Punctum minutissimum, Lea. 



Like No. 43 but smaller, apex higher, very minute. Under leaves. 



Genus Cionella. 



48. Cionella subcylindrica, Binn. 50, 51. 



H. lip and shell very shiny. Damp roadsides. A larger 

 variety occurs in woods. 



Genus Pupa, {Dr.) 

 genus leucochila. 



49. Pupa or Leucochila armifera, Say. 



White, H. 3-16 oblong oval lip reflected, aperture round cup form, 

 four or more irregular teeth. Rocky places. 



50. Pupa or Leucochila fallax, Say. 



Like No. 48, but smaller and dull brown. Under stones. 



51. Pupa or Leucochila rupicola, Say. 



Brown, smaller than No. 50 and more cylindrical, tooth on parie- 

 tal wall. Rocky places. 



