CHEIROPTERA. 11 
VESPERTILIONID 4. BAT-TRIBE., 
VESIVERTILIO NOCTULA. 
CHEIROPTERA.—Bars. 
Ir the fossil remains of the small Mammals which live 
in trees are rare, still rarer, one might have supposed, 
would be those of the much smaller species which are 
organized for flight, and whose bones are necessarily light 
and fragile. The skill of Cuvier, however, long since ex- 
posed a considerable portion of the skeleton of a Bat, allied 
to the Serotine, which was petrified and imbedded in a 
block of the Hocene gypsum at Montmartre. A few fossil 
