52 
EAST WING. 
justify the appellation of " fossil/' in caves or in Pleistocene de- 
posits, associated with the bones of animals either completely 
or locally extinct. Then follow in systematic order the bones 
and teeth of the other Primates ; the Carnivora, Ungnlata and 
Sirenia. 
The greater part of the north side of the gallery is devoted to the 
exhibition of a magnificent collection of the remains of Probos- 
cidea (Dinotheria, Mastodons and Elephants), including the fine 
series from the sub-Himalayan formations of India collected by 
Cautley and Falconer. 
In the pavilion, or large room at the end of the gallery, 
are skeletons and bones of the animals of the order Edentata, 
mostly from South America, including some fine specimens of 
the great Ground Sloths, the largest of which is the Megathermm, 
shown in the act of rearing itself on its hind legs and powerful 
tail to seize and tear down the branches of a tree, in order to 
feed upon the leaves. That this was the habit of this huge 
animal is clearly indicated by the structure of the bones and 
teeth. The mounted specimen is not an actual skeleton, but is 
composed of plaster casts of the actual bones, most of which are 
in the wall-case at the north side of the room. Of the Mylodon, 
a smaller, but nearly allied species, an almost perfect skeleton 
is. exhibited in a glass case near the Megatherium, and not far 
off is the Glyjptodon, a huge extinct Armadillo, enclosed in a 
solid barrel-like bony case. As these animals far surpassed in 
size their diminutive existing representatives, so the gigantic 
Australian Marsupials of the corresponding period (Pleistocene^ 
or latest Tertiary), the Diprotodon and Nototlierium, remains 
of which will be found in this room, greatly exceeded any of the 
species now existing on that continent. On the other hand, all 
the mammals of the earliest geological periods of which remains 
are known, are of diminutive size, as seen in the very interest- 
ing series, mostly from the Purbeck (Upper Oolite) beds of 
Dorset, and Stonesfield (Great Oolite) of Oxfordshire, exhibited 
in one of the table-cases on the north side of the room. 
Extinct Birds. The south side of this room (right on entering) is chiefly 
devoted to the remains of extinct birds, including the famous 
Lizard-tailed Bird {Archceopteryx) of the Solenhofen beds of 
Bavaria, the oldest known member of the class, presenting 
