207 

 ADDENDUM 



CoHREOTioy BY Mr. J. ¥. Whiteaves of Rkmarks Attributed to 

 HIM ON PAGE 133 (Transactions No. 5). 



7c» the Stcrclari/ of the Otlawu Fidd-Xatu7\distg Club : 



Dkar Sir, — On page 133 of vol. 2 of the Transactions of the 

 Ottawa Field-NaturalLsts' Club some remarks are attri'juted to me in 

 which my meaning Las been misundei'stood on two points. 



In reference to the first, what I intended to say, and what I 

 believe I did say was, that, as Dr. Lea pointed out long ago, 

 the rivers flowing immediately west from the Alleghanies, such as the 

 Ohio and other tributaries of the Mississippi, contain a different set of 

 Unionidtie to those which inhabit the streams of New England and the 

 more northern Atlantic States which flow eastward from that mountain 

 range. That to the north, in Canada, wliere no such mountain barrier 

 exists, there is often no such marked distinction between these faunae, 

 ■and that this co- mingling may to some extent have been brought about 

 by such artificial means as the construction of canals, like the V/elland. 

 At the time the remarks were made it did not occur to me that 

 some of the members present might not be aware of the fact that the 

 Unionidai of the Pacific slope belong to quite a different fauna to tlie 

 two already indicated. 



Secondly, in regard to the North American species of Anodonta, it 

 never entered into my mind to suppo.so that all the species that 

 have been described from this continent could be regarded as one. 

 My remarks were to the effect that some of the so-called species 

 which liave so far have been recorded as occurring in Canada (and 

 especially those from the Province of Quebec) have been thought by 

 naturalists of experience to be possibly only polymorphic varieties of 

 the European (and possibly circumpolar) Anodonta cygnea. 



J. F. Whiteaves. 

 August 18th, 1885. 

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