REMARKS ON BRITISH BATS. 165 



downwards or curved slightly outwards, that of the inner 

 incisor directed forwards and inwards; the inner incisor 

 on each side generally with a distinct second cusp placed pos- 



teriorly and externally ; premolars ^^ ; first and second upper 



premolars very small, the second premolar often minute and 



pressed inwards ; molars ^^ ; the last upper molar rather less 



than half the antepenultimate molar. 



Species: — murinus, Schreber ; bechsteini, Leisler ; nattereri, 

 Kuhl; dauhentojiii, Leisler ; mystac inus, Leislev ; dasycne me, Boie. 

 The descriptions of these (with the exception of dasycneme, given 

 on p. 1G2) will be found in Bell's work. 



Genus 3. Plecotus, Geoffroy, Descript. de I'Egypte, ii. p. 113 

 (1812). 



Crown of the head elevated above the short and flattened 

 muzzle. Nostrils opening on the upper surface at the extremity 

 of the muzzle, in front of semilunar naked depressions. Ears 

 united above the forehead, very large, the outer margin ending 

 opposite the base of the tragus, the inner margin with an abrupt 

 rounded projection directed inwards above the base; tragus very 

 large, tapering upwards, with a lobe at the base of the outer 

 margin. Feet slender ; toes more than half the length of the 

 whole foot. Tail equal in length to the head and body, contained 

 (except part of the last caudal vertebra) within the interfemoral 

 membrane. Post-calcaneal lobe distinct. Skull considerably 

 vaulted ; bones forming the brain -case very thin ; occipital and 

 sagital crests scarcely developed. 



,^ . . -, 2-2 1—1 2—2 3-3 



Dentition. — Inc. — p— ; c. yHi > P'"^* q^Hq ' *^' 3^^* 



Species : — auritus, Linn. Described by Bell. 



Genus 4. Synotus, Keyserling & Blasius, Wiegm. Archiv. 

 1839, p. 305. 



Crown of the head distinctly elevated above the short and 

 obtuse muzzle. Nostrils opening on the upper surface at the 

 extremity of the muzzle, in front of a naked space, bounded 

 laterally by the raised edges of the very prominent sides of the 

 face ; anteriorly the upper lip is divided on each side by a deep 



