402 THE MOUNTAIN. 



In the monograph of S. S. Haldeman on the Limniadas 

 and other fresh-water univalve shells, we have the following 

 mollusks registered as belonging to the geographic range of 

 Pennsylvania, some quoted only in the eastern part of the 

 State. 



PHYSA heterostropha, (Say.) Range, from latitude 31 

 to St. Lawrence and Great Lakes. 



LIMNEA desidiosa, (Say.) Range, latitude 35 to 45, 

 and from New England to Mississippi River. In fresh- 

 water streams and lakes. 



LIMNEA carperata, (Say.) Eastern Pennsylvania. 



LIMNEA columella, (Say.) Pennsylvania. 



PLANORBIS bicarinatus, (Say.) New England to Georgia 

 and Tennessee. 



PLANORBIS parvus, (Say.) Eastern, Middle, and Western 

 States. 



PLANORBIS armigerus, (Say.) Eastern, Middle, and 

 Western States. 



AMNICOLA decisa, (Hald.) In "streams connected with 

 the Susquehanna." 



AMNICOLA limosa, (Say.) Maine to Pennsylvania and 

 Ohio. 



AMNTCOLA lapidaria, (Say.) East and west of Alleghany 

 Mountain. 



YALVATA tricarinata, (Say.) New England and Middle 

 States. 



Many of these species are found on the mountain, or in 

 the waters at the eastern or western base, as already re- 

 marked. 



Dekay's catalogue of the Limniadae of New York is a much 

 more extensive list than Haldeman has given to Pennsyl- 

 vania. It should be borne in mind, however, that the mono- 

 graph of Haldeman was published in 1840, and Dekay's in 

 1843. 



The next order of Gasteropoda is the PECTINIBRAN- 

 CHIA. 



