34 MAMMALIA. 



cles and large scapulae; four canini; incisors varying in 

 number ; pectoral mammse. Four tribes. 



TRIBE I. VESPERTILIO, LIN. BATS. 



Fingers of the anterior limbs excessively long, and forming, 

 with the membranes which they sustain, wings as well de- 

 veloped as in Birds ; pectoral muscles very thick ; thumb 

 short and armed with a crooked nail, which these animals 

 use in suspending themselves or in creeping ; hind feet weak 

 and divided into five equal fingers, armed with trenchant 

 claws ; eyes very small ; touch very delicate, having its seat 

 in the skin of the ears and the wings ; nocturnal animals, 

 passing the winter in lethargy. 



Group I. Fructivorous Bats. 

 GENUS PLEROPUS, Briss. 



Molar teeth with flat crowns ; the second finger before 

 armed with a nail like the thumb. 



Group II. True or Insectivorous Bats. 



Molar teeth studded with conical points, fitting into each 

 other so as to break the horny shells of insects, and to pre- 

 vent the escape of so small a prey ; no nail on the second 

 finger. Four remarkable kinds. 



GENUS I. VESPERTILIO, Geoff, and Cuv. 



Ears separated and of moderate size ; nose without appen- 

 dage ; tail comprised in the membrane. Common Bat; Sero- 

 tine; Pipistrell. 



GENUS II. MEGADERMA, Geoff. Oreillard. 



Ears larger than the head, and joined to each other. 



GENUS III. RHINOLOPHUS, Geoff, and Cuv. 



Nose furnished with membranes and with crests, present- 

 ing the rude figure of a horse shoe. 



GENUS IV- PHYLLOSTOMA, Geoff, and Cuv. 



Membrane in the form of a leaf folded up upon the end of 

 the nose ; tongue extensible, terminated by papillae, which 

 appear to form an organ of suction. Vampire ; Javelin Bat. 



