318 OHIO STATE ACADEMY OF SCIENCE. 
Helicodiscus parallelus (Say, Planorbis), H. lineata Say. 
Over the state, common. 
Punctum pygmeum (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 /sthmia edentula, but does not 
range under the Pupide (as swown by the writer). 
VALLONIIDA. 
Vallonia pulchella (Muller, Helix). Pal. 
Over the state, common, somewhat variable. 
7Vallonia excentrica Sterki. Pat 
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 hsted 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. 
7Vallonia parvula Sterki. x 
Sandusky (St.); Put-in Bay! (Allen), Walker. 
FAM, -——.* 
Strobilops labyrinthica (Say Helix), Strobila labyrinthica. 
Over the state, preferably at damp places. 
TStrobilops affinis Pilsbry. 
Summit Co.; probably over the state. 
{Strobilops virgo (Pilsbry, Strobila labyrinthica virgo). X 
New Philadelphia (St.); seems to prefer elevated and dry 
places. 
PUPIDZ. 
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 Pupidz, but believe 
that it was a mistake. 
