54 
FOSSIL MAMMAL GALLERY. 
in which we are now living. Some of these belong to species 
still existing upon the earth, but the great majority are 
extinct. They are arranged mainly upon zoological principles, 
that is, the forms which are believed to have natural affinities 
are placed together, but within some of the great divisions thus 
mapped out, especially of the invertebrata and plants, it has 
been found convenient to adopt a stratigraphical or even 
geographical grouping, the fossils of different geological forma- 
tions being kept apart, and those of the British Isles separated 
from those of foreign localities. 
Fig. 2.5. — Skeleton of Amertcak Mastodon. 
As this portion of the Museum is fully described in the 
Illustrated Guides,* it will only be necessary to give a brief 
account here. 
EemainB of The large front gallery first entered from the hall is entirely 
extinct devoted to the remains of Mammalia. Along the centre are 
MammalB. 
* * Guide to the Exhibition Galleries of the Department, of Geology and 
Palsnontology.' Part I. Mammalia and Birds; price sixpence. Part II. 
lioptilia and Fishes, Northern Galleries; price sixpence. 
