476 The American Naturalist. 
Morong, of Columbia College, is now distributing to subscribers, 
set recently received contains 83 North American and Eu 
species and varieties, representing quite satisfactorily this differ 
group. When the author's “ Revision of the North American 
ace,” now in the press, is received, there will be little reason 
dents and collectors neglecting these interesting acquatics. 
E. Bessey. 
Canadian Mosses and Lichens.—Several years ago, Dr. 
Macoun began the distribution of sets of “Canadian Musei; 
material secured in his extensive collecting expeditions in the 
ests of the north and west. During the winter the fifth century 
to hand, including numbers 501 to 600, some of which are inte 
new species. 
With this century of mosses came Century I of “ Canadian Li 
which promises to be fully as interesting a distribution as the 
The specimens are ample, and the labels are of the same neat 
those of the mosses——CHArtes E. Brssry. 
