Appendix. 43 



Another correspondent of Nature (V., 225), Mr. J. J. Murphy, 

 suggests that the Antarctic lands are also rising. Still another 

 correspondent, Geo. Hamilton, tries to show that the earth being 

 an ellipsoid, a uniform shrinkage would result in a change of 

 form and an apparent elevation in the circumpolar regions. 



LIST OF LAND AND FRESH-WATER SHELLS FOUND 



WITHIN A CIRCUIT OF FOUR MILES 



ABOUT ANN ARBOR, MICH. 



CLASS, Gasteropoda. ORDER, Prosobranchiata. 



FAMILY, Melaniidce. 



Goniobasis Milesii Lea, (Huron River). 

 Goniobasis Levesens Mke., (Huron River). 



FAMILY, Valvatidce. 

 Valvata tricarinata, Say, (Huron River.) 



FAMILY, Viviparidce. 

 Melantho integra, Say, (Still water, Huron River). 



FAMILY, Rissoidce. 



Amnicola porata, Say, (Huron River). 

 Amnicola lustrica, Say, (Huron River). 

 Pomatiopsis Cincinnatensis, Anth., (River banks). 



ORDER, Pulmonata. FAMILY, Helicidce, 



Macrocyclis concava, Say, (School- Girl's Glen). 



Limax campestris, Binney, (Common under dead wood). 



Helix albolabris, Say, (common). 



Helix alolabris var. dentata, (occasional.) 



Helix alternata, Say, (common). 



