MUSEUM OF COMPARATIVE ZOOLOGY. 



207 



Macrocyclis concava. 

 Patula solitaria. 



alternata. 



perspectiva. 

 Helix lineata. 



labyrinthica. 



auriformis. 



stenottema. 



hirsuta. 



monodon. 



palliata. 



obstricta. 



appressa. 



Helix inflecta. 



albolabris. 



elevata. 



exoleta. 



tkyroides. 



clausa. 



profunda. 

 Pupa armifera. 



contracta. 

 Succinea obliqua. 

 Helicina* orbiculata. 

 occulta. 



Of the above all are now living and are equally numerous, excepting 

 Helicina occulta, a species most abundant in Post-pleiocene days, but 

 now almost extinet.f The other species of Helicina is now confined 

 to more southern limits. 



In addition to the above, the following species, now living in the In- 

 terior Province, probably had their origin in Post-pleiocene times, and 

 will, no doubt, be found fossil in the " bluffs " : — 



Zonites friabilis. 



leevigatus. 



suppressus. 



indentatus. 



internus. 



minusculus. 



limatulus. 

 Helix Dorfeuilliana. 

 leporina. 

 multilineata. 

 Pennsylvanica. 

 Mitchelliana. 

 dentifera. 



Helix bucculenta. 

 Sayii. 

 tridentata. 

 fall ax. 

 Pupa pentodon. 

 fallax. 

 rupicola. 

 corticaria. 

 Vertigo milium. 



ovata. 

 Succinea avara. 

 ovalis. 



* Though not Pulmonata, these two species are strictly terrestrial in their habits, 

 and arc here introduced from their value on the question of the permanence of the 

 Post-pleiocene species. One of them is almost extinct, the other more restricted in 

 its range at present. 



t Sec A. Binney, Terr. Moll. U. S., I. 183, 184; Bland and Binuey, Ann. Lye. 

 N. II. of N. Y., IX. 289. 



