98 Natural History of the 



29. Planorbis frivolvis, Say. — Collected by Mr. J. Lowe, in a small lake 



one mile west of the Indian Village on the Rouge, 

 Township of Arundel. 



30. " bicarinatus, Say. — In shell marl, and living in Eagle Nest 



Lake, Went worth, and in a small lake near Hamil- 

 ton's farm. 



31. " companulatus, Say. — Pools near Grenville ; Eagle Nest 



Lake, Wentworth ; a small lake west of Chain 

 Lake (a few dead specimens full of minute holes) ; 

 Sugar-bush and Bevin's Lakes, Montcalm ; the 

 lake one mile west of the Indian Village, Arun- 

 del ; and in a small lake near Hamilton's farm. 



32. " parvus, Say. — Abundant in shell marl. Eagle Nest Lake, 



Wentworth ; living in the lake one mile west 

 of the Indian Village, and in one near Hamilton's 

 farm. 



33. " deflectus, Say. — Abundant amongst decaying leaves in 



shallow and muddy parts of Sixteen Island and 

 Sugar-bush Lakes, Montcalm. 



34. Paludina decisa. Say. — Very abundant the whole way up the Rouge 



and its tributary the Devil's River. Those col- 

 lected are of a reddish brown colour, very unlike 

 the light green of specimens from L'Orignal op- 

 posite the mouth of the Rouge, or those from the 

 St. Lawrence near Montreal. They were encrusted 

 with a rusty-red sponge-like substance. 



35. Valvata tricarinata, Say. — A few specimens found in shell marl from 



the bottom of Eagle Nest Lake, Wentworth. 



CoNCHiFERA (Fresh Water.') 



1. Unio complanatus, Lea.— This was the only species of Unio met with. 



It inhabits nearly every lake in the district and 

 was abundant the whole way up the Rouge as 

 far as we ascended. In shallow and muddy parts 

 of Sixteen Island Lake it attains a considerable 

 size and weight, but in the other lakes and in the 

 Rouge the specimens were generally rather small. 

 It was most numerous in the stream through 

 which the waters of Bevin's and Bark Lakes are 

 discharged into the Rouge, where, in shallow 

 places, thousands might be seen buried in the mud 

 with only the tips of their valves sticking out, and 

 as thick as they could lie together. The speci- 

 mens collected vary much in shape, and in the 

 colour of the interior of the valves, which, ex- 

 cept those from Bevin's Lake, have hardly any of 

 the beautiful purple colour generally possessed 



