XVI INCISORS OF GALEZOPITHECUS 521 
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Galeopithecus' inhabits the Oriental region. It is a larger 
animal than any other Insectivore, about the size of a Cat, and 
has a patagium extending between the neck and the fore-limb, 
between the fore-limb and the hind-limb, and between the hind-limb 
and the tail. This patagium is abundantly supplied with muscu- 
lature, but the fingers are not elongated as in the Bats for its 
support. In the degree of its development, however, the pata- 
cium of this creature is midway between that of Sccwropterus 
on the one hand, and the Bats on the other. It presents many 
remarkable features in its organisation. The brain is lke that of 
the Insectivora in the exposure of the corpora quadrigemina by 
the slight extension backward of the cerebral hemispheres; but 
its upper surface is marked by two longitudinal furrows on each 
side, a state of affairs (in combination) which is unparalleled 
among the Mammalia. The teeth are peculiar by reason of the 
singular “comb-like” structure of the lower incisors. This, how- 
ever, IS an exaggeration of what is to be found in Rhynchocyon 
and Petrodromus, while the same style of tooth, though not so 
highly developed, characterises certain Bats. The Tupaiidae and 
certain Lemurs show what Dr. Leche regards as the beginning of 
the same thing. As in Zupaia also there is an indication of 
the characteristically Lemurine sublingua. The stomach is more 
specialised than in other Insectivores, the pyloric region being 
extended as a narrowish tube. There is a caecum. <A peculi- 
arity of the intestinal tract is that the large intestine is longer 
than the small. 
Order XII. CHIROPTERA. 
We may thus define the Bats:—Flying mammals, with the 
phalanges of the four digits of the hand following the pollex 
greatly elongated, and supporting between themselves and the 
hind-limbs and tail a thin integumental membrane, which 
forms the wing. The radius is long and curved; the ulna rudi- 
mentary. The knee is directed backwards, owing to the rota- 
tion of the limb outward by the wing membrane. From the 
inner side of the ankle-joint arises a cartilaginous process, the 
ealear, which supports the interfemoral part of the wing mem- 
1 Leche, ‘‘ Uber Galeopithecus,” K. Svensk. Ak, Handl. 1886. 
