412 



ORDEES OF MAMMALIA. 



hotli sides, and it serxes for flight. Of the fingers of the hand, 

 the pollex, and sometimes the next finger as well, is wiguiculate, 

 or furnished loith a claiv ; hut the other digits are destitute of 

 nails. In the hind-limhs all the toes are unguicidate, and. the 

 hallux is not in any respect different from the other digits. 

 Well-developed clavicles are always p)resent, and the radius has 

 no power of rotation upon the %dna. The mammary glands are 

 tim in number, and are placed upon the chest. There arc teeth 

 of three kinds, and the canines are always well developed. The 

 molars are tuhereidate or grooved in the frugivorous forms, and 

 cuspidate in the insectivorous species. The idna is sometimes 

 quite rudAmenta.ry. The hones are not i^neumatic. 



Fig. 685.— Skeleton of Fox-bat {Pteropm). (After Owen.) 



The living Bats are divided into the two groups of the 

 Frugivorous Bats, comprising the single family of the Pteropida:. 

 (Fox-bats or Eoussettes), and the Insectivorous Bats, com- 

 prising the three principal families of the Vespertilionidce, the 

 Rhinolophidoi (Horse-shoe Bats), and the Phyllostomiche (Vam- 

 pire Bats). The Cheiroptera are represented in Europe for the 

 first time in the Eocene Tertiary, and that by a form very 

 similar to the existing European Bats. The fossil in question 



