1034 The American Naturalist. [December, 
I adopted the three remaining regions, the Oriental, the Holarctic, and 
the Medicolumbian ; the last name being derived from Blanford, and 
used as a substitute for Sonoran, which have been previously used for 
a subdivision, 
This work is a magazine of information on the subject of which it 
treats, and a unique feature is the 
large amount of reference to the 
facts of paleontology. This increases 
the value of the book to the general 
reader, but cannot be said to be 
è ermane to its main object. The 
Plagiaulax minor from the English introduction of the extinct forms of 
Wealden; much enlarged. ife necessarily changes the aspect of 
the faunal lists of a country to a marked degree, nowhere moreso than 
in the Arctogæan Realm. Each geological period had in fact its own 
geographical distribution of forms, and when all are discovered a series 
of books on geographical distribution in each period might be written, 
each different from every other one. 
K = 
orean 
> 
Manis tricuspis West Africa. 
The well-known familiarity of the author of this book with both 
Mammalian zoölogy and paleontology, gives it a value which no 
similar book possesses; and its compact form and fulness of illustration 
