378 OHIO STATE ACADEMY OF SCIENCE. 



Helicodiscus parallelus (Say, Planorbis), H. lineata Say. 



Over the state, common. 

 Punctum pygmaeum (Draparnaud, Helix), minutissima Lea. Pal. 



Over the state, common. 

 Sphyradium edentulum (Daparnaud, Pupa), Pupa simplex Gould. 

 Pal. 

 Cincinnati; Husdon, Summit Co.! (Pettingell) ; Tuscarawas 



Co. (St.) ; probably over the state. 

 Listed as Pupa, Vertigo and Isthmia edentula, but does not 

 range under the Pupidae (as swown by the writer). 



VALLONIID^E. 



Vallonia pulchella (Muller, Helix). Pal. 



Over the state, common, somewhat variable. 

 fVallonia excentrica Sterki. Pal. 



Lake, Tuscarawas, Guernsey, Hamilton and Defiance Coun- 

 ties (St.); East Cleveland!, in lawns, by tens of thous- 

 ands (Allen.) ; probably over the state. This seems 

 to be one of the few species which have rather increased 

 in numbers, in consequence of deforestation and cultiva- 

 tion of the land. 

 Vallonia costata (Muller, Helix). Pal. 



Over the state. It has been listed as pulchella var. costata, 

 but is quite distinct; the ribs are not the only distin- 

 guishing feature, but also the shape of the whorls and 

 of the aperture. 

 fVallonia parvula Sterki. X 



Sandusky (St.); Put-in Bay! (Allen), Walker. 



FAM. .* 



Strobilops labyrinthica (Say Helix), Strobila labyrinthica. 



Over the state, preferably at damp places. 

 fStrobilops affinis Pilsbry. X 



Summit Co.; probably over the state. 

 fStrobilops virgo (Pilsbry, Strobila labyrinthica virgo). X 



New Philadelphia (St.) ; seems to prefer elevated and dry 

 places. 



PUPID.-E. 



Pupoides marginata (Say, Odostomia, Pupa), Pupa fallax of 

 authors. 

 Over the state. 

 Bifidaria procera (Gould, Pupa). 



Cincinnati; Columbus; Hamilton (St.); probably over most 

 of the state, but e. g. not found in Tuscarawas Co. 

 Listed as "Pupa rupicola" Say, for which (southern 

 species) it has been mistaken. 



*Some years ago, I ranged Strobilops under the Pupidae, but believe 

 that it was a mistake. 



