56 Rev. L. JENYNS on the Distinctive Characters 
of the auricle 
Breadth of the auricle 
Length of the tragus . 
Breadth of the tragus.. 
Length of the arm - 
—~—-— of the forearm 
of the thumb . 
of the phalanges of the RR papers ! 
or the distance from the carpus to the 
Dimensions. 
Leugth of the head and body, from the nose EE Lines, 
tte We root of the tail 7 6670630973 6 
of the head 7 
of the tail . 9 
O 
5 
CK OCG O- +} © 
to 
apéx ofthe winp — = < Sem ene d 8 
BOUM 6x :0—— 5 
of the shank . .-. EU 54 
Exsertion of the tail iy the interfemoral "uos | 
membrane. . — ~ LoCo 6 gero) 1 
Expansion of the flying mémbrine ien 3e mee 
I shall now detail more in particular some of the leading dis- 
crepancies between these two species, most of which are drawn 
from a comparative view of their respective dimensions as exhi- 
bited in the foregoing tables. It will be observed, in the first 
place, that in the Plecotus auritus the auricle is much larger in 
proportion to the body, and longer in proportion to the tragus, 
than in the P. brevimanus : and again, that in the former species 
the tail exceeds the forearm in length by three lines; whilst.in 
the latter these parts are equal. There is nearly as great a 
difference with respect to the relative proportions of the femur 
and tibia, which are likewise of equal length in the P. brevi- 
manus. 
uude agan A aeaa PA 
