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January, 18 g^, 

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Volume VII. No. 10. 
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THE BEAVER (Castor Canadensis, KuhlJ. 
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Page 
The Extinct Northern Sea-Cow, and early Russian Explorations in the 
North Pacific 151 
A Planorbis new to the Ottawa List 161 
Hymenoptera Phytophaga, 1893 , 162 
Ornithology . . . 164 
Book Notice 164 
Editorial Notes 165 
^ 
OTTAWA, CANADA: 
I'aynter & Abbott, Printers, 48 Rideau Street. 
Issued January 16th, i8g4- 
Published Monthly at $1.00 per annum. 
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