104 



THE BATS. 



most abundantly represented in hot climates, 

 is to be found even in the polar regions and 



high up in the mountains. The snout is 

 very short, the premaxillary bones placed 



Fig. 38. The Long-eared Bat (Plecotus auritus). 



laterally, so that a deep median gap separates 

 the upper incisors on the different sides of 

 the jaw; the ears are almost always large, 

 membranous, and naked, and the inner ear- 

 flap, the tragus, is developed in the form of 

 a tongue- or spoon-shaped ear-covering. 



To this group belongs the Long-eared Bat 

 (Plecotus auritus) of Europe, fig. 38. 



The skull is highly arched, the facial region 

 attached to the rest of the skull at an angle. 

 On both sides of the median gap or diastema 

 in the upper jaw stand two small incisors, 



Fig. 39. The Barbastelle or Pug-nose Bat (Svnotus iartastellus). 



which are followed by a strong recurved 

 canine; then come two single -cusped pre- 

 molars, and three molars with several cusps. 

 In the lower jaw six incisors are crowded 

 together in the space corresponding to the 

 diastema in the upper jaw, and after the 

 canine follow three single-cusped premolars, 



and the same number of molars with several 



2 ' I ' 2 3 



cusps. The dental formula is thus . . 



O O *5 



= 36 teeth. 



The large papercornet-shaped ears strike 

 us at the first glance. They measure more 

 than two-thirds of the whole length of the 



