XVI INCISORS OF GALEOPITHECUS 52 1 



Galcopithccus ^ iu habits the Oriental region. It is a larger 

 animal than any other Insectivore, about tlie size of a Cat, and 

 has a patagium extending between the neck and tlie fore-limb, 

 between the fore-limb and tlie hind-limb, and between the hind-limb 

 and tlie tail. This patagium is alnindantly 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- 

 gium of this creature is midway between that of Sciuro2Jterus 

 on the one hand, and the Bats on the other. It presents many 

 remarkable features in its organisation. The brain is like 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 coinlunation) 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 Rhynchoeyon 

 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 Tajxda 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 tulje. 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 

 calcar, which supports the interfemoral part of the wing mem- 



^ Leche, " IJber Galeopithecus," K. Svcnsk. Ak, Handl. 1886. 



