POSTGLACIAL BIOTA OF THE GREAT LAKES REGION 



189 



Caryckium exiguum (Say) 



Vallonia parvula Sterki 

 VaUonia pidchella (Miiller) 



Gastrocopta contractu- 2 * (Say) 



tappaniana (Adams) 

 pentodon (Say) 

 corticaria (Say) 

 armifera (Say) 



Pupoides marginatus (Say) 



Family Aukiculidae 



Carychium exile H.C. Lea. 

 Family Vallonudae 



Vallonia gracilicosta Reinh. 



Family Pupillidae 



Vertigo milium Gould. 

 " ovata Say 

 '. morsei Sterki 

 " Iridentata Wolf 

 " elatior Sterki 

 Strobilops labyrinthica (Say) 

 " a finis Pislbry 



Family Succineidae 

 Succinea ovalis (Say) = obliqua Say. Succinea retusa Say 



" avara Say 



Family Endodontldae 

 Puticlum pygmaum (Drap.) Pyramidula alternata (Say) 



Sphyradium edentulum (Drap.) " solitaria (Say) 



Helicodiscus parallelus (Say) " perspectiva (Say) 



" cronkhitei anlhonyi Pislbry 



Gaslrodonta ligera (Say) 

 Zonitoides minscida Sterki 

 " laeviscula Sterki 

 " arborea (Say) 

 Euconulns ftdvus (Miiller) 

 " chersinus (Say) 



Family Zonitidae 



Euconulus sterkii (Dall) 

 Vitrea hammonis (Strom.) 

 " wheatleyi (Bland) 

 " indentala (Say) 

 ' rhoadsi Pilsbry 

 Omphalina fuliginosa (Griffith) 



" chersinus polygyratus (Pilsbry) 



Family Limacidae 

 Agriolimax campestris (Binney) Limacid, species indet. 



Family Circl\ t ariidae 

 Circinaria concava (Say) 



Polygyra monodon (Rackett) 

 " hirsuta (Say) 



mitchelliana (Lea) 

 " clausa (Say) 

 " thyroides (Say) 

 " elevata (Say) 

 " multilineata (Say) 



zaleta (Binney) = exolela Binn. 



pennsylvanica (Green) 



Family Helicidae 



Polygyra albolabris (Say) 



" albolabris dentata (Tryon) 



" sayana Pils. = sayi (Binn.) 



" profunda (Say) 



" inflecta (Say) 



" fraudulenta Pilsbry 



" Iridentata (Say) 



" palliala (Say) 



Eggs of land snail. 



224 This genus was previously known as Bifidaria. Gastrocopta is an earlier name. 



