458 0?i Land and Fresh Water MoUusca, 



I have six fresh water shells hitherto not known to inhabit Cana- 

 da, which have been introduced in this way ; five are from the 

 Welland Canal, and one is from the Thames river at Chatham, 

 C.W. ; they are all well-known Ohio shells. The object of this 

 paper has been a suggestive one, and if by these few remarks I 

 shall have attracted attention to the interesting subject of our land 

 and fresh water shells, my labour will not have been in vain. 



List of land and fresh loater shells hitherto not known as in- 

 habiting Lower Canada. 



Anodonta undulata, Say. St. Charles River, near Quebec. 



Anodonta decora, Lea. Old quarries near the Mile-end, Montreal. 



Anodonta plana, Lea. Eideau Canal near Ottawa City. 



Unio luteolus? Lam. var. Common in the St. Lawrence both at 

 Quebec and Montreal. 



Unio compressus, Lea. (U. alasmodontinus? Barnes). Assumption 

 River, M.deVilleneuve : Rideau Canal near Ottawa City, Mr. Billings. 



Cyclas rhomboidea, Say ; and two species as yet undetermined ; St, 

 Lawrence, at Quebec. 



Pisidium variabile ? Prime ; and four species not yet determined. 



Planorbis armigerus, Say. Trenches in fields near Quebec. This 

 shell belongs to the genus Planorbalina of Haldeman. 



Planorbis deflectus, Say. Streams near Quebec. 



Limnsea columella, Say. Common in the St. Lawrence near Quebec, 

 at low water, with its variety macrostoma. 



Helix rufescens, Muller. Common in the Cove fields, Quebec, but 

 probably introduced. 



Helix capsella, Gould. Island of Orleans, but very rare. 



Helix dentifera, Binney. St. Lambert, Montreal. 



Pupa armifera, Say. Abundant in the Cove fields, Quebec. 



Pupa contracta. Say. Island of Orleans. 



Shells neio to Upper Canada. 



From the T\^elland Canal and its neighbourhood : 



Unio gracilis, Barnes. Physa gyrina, Say. 



" coccineus ? Lea. Helix palliata, Say. 



" plicatus, Lesuer. " thyroidus, Say. 



Paludina Integra, Say. 



From the river Thames at Chatham, C. W : 



Unio circulus. Lea. 



Canadian fresh water shells which occur also on the west side of 



the Rochy 3Iountains. 



Valvata sincera, Say. 



Limnaea solida, Lea. (L. apicina, Lea). 



" catascopium, Say. 



" jugularis, Say. (L. stagnalis, Linn). 



" palustriSj Linn. (L. elodes, Say). 



" pallida, Adams. 

 Physa heterostropha, Say. 



" hypnorum, Linn. (P. elongata, Say). 

 Planorbis corpulentus, Say. 

 " trivolvis. Say, 



