178 The Ohio Journal of Science [Vol. XX, No. 6, 



rains. Only parts of the area exposed could be searched over, 

 though on a stretch of about a mile, in 1915 and 1917. I 

 acknowledge with thanks that on both occasions the officers and 

 engineers of the Portland Cement Company showed me much 

 kindness by giving information and chances to ride on the 

 engines of their trains to and from the marl field. 



Most of the shells are chalky. Those of Pyramidula alternata, 

 Polygyra multilineata and some P. profunda still show more or 

 less of the reddish markings. But many are like fresh ones, 

 translucent or transparent, e. g., all of Vallonia and Pupoides 

 marginata, some of Zonitoides minusculus, Vitrea indentata, 

 Gastrocopta armifera, contracta, tappaniana, and all of one form 

 of Succinea avara. 



List of Species. 



Gastrodonta ligera Say, a few. 



Zonitoides arboreus Say, rather frequent. 



Zonitoides minusculus Binney, abundant, markedly different 

 forms; some are quite small with narrow whorls. Many 

 have a "lip" deposit in the peristome, close to the margin 

 to a good distance from it. 



Vitrea hammonis Strom (radiatula Alder), common. 



Vitrea wheatleyi Bland, a few. 



Vitrea rhoadsi Pilsbry, one shell, not full-grown. 



Vitrea indentata Say, common; many are distinctly though 

 narrowly umbilicate. 



Euconulus fulvus Muller, frequent. 



Euconulus chersinus Say, scarce. 



Euconulus sterkii Dall, scarce. 



Agriolimax campestris Binney, some shell plates. 



Limax ? one shell plate, 5 mm, long, 3.5 broad and rather 



thick. This is of particular interest, since no indigenous 

 Limacid of large size is known to inhabit this region. 



Circinaria concava Say, rather frequent. 



Helicodiscus lineatus Say, common. 



Pyramidula solitaria Say, a few, rather large. 



Pyramidula alternata Say, rather scarce. 



Pyramidula perspectiva Say, scarce. 



Pyramidula cronkheitei anthonyi Pilsbry, scarce. 



Punctum pygmaeum Draparnaud, rather scarce. 



Sphyradium edentulum Draparnaud, one specimen. 



