INVEBTEBRATA. 



397 



Pneumobranchiate 

 Mollusca. 



SECT. I. 



Terrestrial. 



Living upon 



the land. 



FAMILIES. GENERA. 



f Vaginulus. 

 , T . . , J Tebennophorus. 



^ Limax. 



fVitrina. 

 Succinea. 

 Helix. 

 Bulimus. 

 [_ Glandina. 



{Cylindrella. 

 Pupa. 

 Vertigo. 



TLimnea. 

 SECT. n. f Limneacte 



L the waters. Auriculadse . Auricu i a . 



TERRESTRIAL MOLLUSKS. 



The Alleghany in Pennsylvania is within Dr. Binney's 

 geographic distribution, Section No. 4, or the " northern in- 

 terior section," which ''includes the country between the 

 Ohio River and the Great Lakes, and between North Caro- 

 lina and New York and Vermont. It extends west of the 

 Mississippi River." This region, from its geology, climate, 

 soil, and vegetation, would seem to be extremely favorable 

 to the existence and increase of terrestrial mollusks. Dr. 

 Binney says, volume first, page 124, of this section, "Va- 

 ginulus, Glandina, Helicina, the larger species of Bulimus, 

 and Cyclostoma, restrained by climatal influences, have dis- 

 appeared ; but the majority of the species of Helix, Suc- 

 cinea, Pepa, and Yertigo, flourish in great numbers, and all 



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