Valley of the River Rouge, 8fc, 99 



by this species as it occurs in the St. Lawrence 

 and Ottavra. The muskrats devour vast numbers 

 both of this species and of the ^nodontce, deposi- 

 ting their empty valves in large heaps on the 

 shores of the lakes and streams. 



2. Alasmodon rugosus, Barnes. — One specimen obtained in the fourth 



small lake* west of Balsam or Chain Lake, Lot 

 11, Range 3, Montcalm. 



3. Anodonta cygnea ? Linn. — This species was found in almost every 



lake we visited. The largest specimen met with 

 was obtained from a small lake occupying part 

 of an ancient channel of the Rouge, near Hamil- 

 ton's farm, and measured 41 inches in length and 

 2^ inches in height. 



4. " edentula, Say. — One specimen obtained by Mr. J. Murray, 



at the same time with the specimen of Masinodon 

 rugosus in the lake situated in the 11th Lot, 3rd 

 Range, Montcalm. 



5. " fragilis, Linn. — Eagle Nest Lake, Wentworth ; Sixteen 



Island and Bevin's Lakes, Montcalm. 



6. " FootianOj Lea. — With the last species. 



7. Cyclas siinilis^ Say. — Living in Sixteen Island and Sugar-bush Lakes, 



Montcalm ; in a small lake one mile west of the 

 Indian Village, Arundel ; and in shell marl in 

 Eagle Nest Lake, Wentworth. 



8. " partumeia ?^Say. — Young specimens amongst dead leaves 



in ponds near Eagle Nest Lake, Wentworth ; in 

 Sugar-bush Lake, Montcalm ; and the small lake 

 near Hamilton's farm. 



9. " dw&ia? Say. — In shell marl. Eagle Nest Lake, and living in 



the small lake near Hamilton's farm. 



ExETEB, Devonshire, January 30, 1860. 



* This lake communicates by a rapid stream with Sugar-bush Lake, which is con- 

 nected with Bevin's Lake, aiid the latter is in direct communication with the 

 Rouge by a large creek about two miles in length. The difference in level between 

 these lakes and the Rouge is only a few feet, but there is a verj' considerable rise 

 between them and Chain and Sixteen Island Lakes, which also empty their waters 

 into Bevin's Lake, but by a very circuitous route. Bevin's Lake rises about 12 feet 

 in spring when the snow disappears. 



