144 



LIFE OF THE PLEISTOCENE 



Vitrea indentata, common. 



Euconulus fulvus, frequent. 



Euconulus chersinus, scarce. 



Euconulus sterkii, scarce. 



Agriolimax campestris, some shell plates. 



Limacid, species indet. One shell plate, 5 



mm. long, 3.5 mm. broad, rather thick. 

 Circinaria concava, rather frequent. 

 Helicodiscus lineatus, common. 

 Pyramidula solitaria, scarce. 

 Pyramidula alternala, rather scarce. 

 Pyramidula perspcctiva, very scarce. 

 Pyramidula cronkhitei anthonyi, very scarce. 

 Punctum ■pygmcsum, rather scarce. 

 Spkyradium edentidum, very scarce. 

 Polygyra profunda, common, large. 

 Polygyra multilineata, abundant, one speci- 

 men reversed. 

 Polygyra albolabris, scarce. 

 Polygyra tkyroides, common. 

 Polygyra pennsyhanica, but one specimen 



found. 

 Polygyra palliata, scarce. 

 Polygyra tridentata, rather scarce. 

 Polygyra fraudulenta, common. 

 Polygyra monodon, abundant. 

 Polygyra hirsuta, frequent. 

 Strobilops labyrinthicus, rather scarce. 

 Slrobilops affinis, abundant. 

 Vallonia pidchella, frequent, of fresh appear- 

 ance, not chalky. 

 Pupoides marginatus, common, of fresh 



appearance, not chalky. 

 Gastrocopta armifera, typical form rather 



scarce. 

 Gastrocopta contracta, common. 

 Gastrocopta pentodon, scarce. 

 Gastrocopta tappaniana, abundant, mostly of 



a small, oval form. 

 Gastrocopta corticaria, very scarce. 

 Vertigo ovata, rather frequent. 

 Vertigo morsel, common. 

 Vertigo elatior, common. 

 Vertigo tridentata, very scarce. 

 Vertigo milium, very scarce. 

 Succinea ovalis, rather frequent. 

 Succinea retusa, rather frequent, different 



forms. 

 Succinea avara, rather frequent, shells fresh, 

 not chalky. 



Succinea avara?, form with long, . slender 



spire, apparently distinct; 8-10 mm. long, 



4+ whorls. 

 Carychinm exiguum, abundant. 

 Carychium exile, rather scarce. 

 Galba reflexa, common, variable. 

 Galba nashotahensis, frequent. 

 Galba humilis modicella, rather common. 

 Galba humilis rustica, frequent. 

 Galba parv'a, not common. 

 Galba dalli, common. 

 Galba caperata, rather common. 

 Planorbis trivolvis, abundant. 

 Planorbis umbilicatellus, two, small and 



probably immature. 

 Planorbis parvus, common, rather small with 



narrow whorls. 

 Planorbis crista cristatus, scarce. 

 Segmentina armigera, common. 

 Ancylus, several species not yet identified. 

 Gundlachia species, one specimen. 

 Physa gyrina, common and variable. 

 Physa integra, rather scarce. 

 Physa heterostropha? , small with short spire; 



frequent. 

 Physa aplectoides, scarce. 

 Aplexa hypnortim, rather scarce. 

 Goniobasis livescens, common. 

 Pomatiopsis lapidaria, fairly common. 

 Pisidium abditum, frequent. 

 Pisidium pauperculum, scarce. 

 Pisidium medianum, very scarce. 

 Pisidium rolundatum, verv scarce (one 



valve). 

 Not a trace of Unionidae observed. 



Fossil mollusks from Tinker's Creek marls, 

 Summit County, Ohio 



Zonitoides arborea, very scarce. 

 Vitrea indentata, very scarce. 

 Pyramidula cronkhitei anthonyi, very 

 scarce. 



Polygyra profunda, one specimen. 

 Succinea ovalis, very scarce. 

 Succinea retusa, very scarce. 

 Succinea avara, very scarce. 

 Carychium exiguum, very scarce. 

 Lymnaea stagnalis appressa, rather scarce. 

 Acella haldemani, scarce, a few fragments 

 only. 



