MAMMALIA ROOM.] NATURAL HISTORY. 
59 
brane is very narrow. The true Horse-shoe Bats have 
a long tail, inclosed in a large interfemoral membrane; 
and there is a process between the nostrils ; they are 
only found in the Old World. The nose-leaf of Rhinolo - 
phus is lanceolate and erect; of Hipposideros short, re¬ 
flexed, with a thick cross rib; and in Asellia three¬ 
toothed. Cyclopia, which has the same kind of nose-leaf 
as Hipposideros , has an expansile pore on the forehead. 
These Bats often have the side of the face covered with 
transverse membranous folds. 
The remainder of the Bats, or Cheiroptera , have been 
called Simple-nosed Bats ( Anistiophora ), because their 
nostrils are simply pierced in the end of the muzzle, 
without any nasal disk. 
The tribe of true Bats ( Vespertilionina) have acutely 
tubercular grinders, broad and large wings, with an elon¬ 
gated tail, as long as, and inclosed in a large conical in¬ 
terfemoral membrane. The upper cutting teeth are near 
the canines, and separated by a space from those of the 
opposite side. They are divided into genera, according 
to the form of the nostrils and ears. In Nycteris the 
nostrils are each placed in the front of a groove; the 
grooves are close together in front, and diverge from one 
another behind, and are covered by the spirally indexed 
outer margin, which is notched in front for the entrance 
of the air. The Petalia of Africa only differs from the 
Nycteris of Asia in the ears being close together, but not 
united in front. Nyctophilus , Barbastellus , and Plecotus 
have large united ears like the former, but each of the 
nostrils is seated in the front of a short lunate nasal 
groove, in Nyctophilus the grooves are united behind 
into an elevated crest, extending across the nose; in the 
other two genera, the grooves are simply lunate, and the 
forehead has an oval bald line, the Bai'bastelli having 
broad sub-quadrate, and the Plecoti , elongate ears. 
The remainder of this tribe of Bats have the ears se¬ 
parate on the side of the head. Romicea has the grooves 
of the nostrils elongated, converging, and united behind 
into a single groove, on the centre of the nose, between 
the swollen cheeks. In the others, each of the nostrils 
has only a very short groove behind it, as the genus 
Vespertilio , which has thin ears and wings; and Scoto- 
philas with thick ears and wings. Natalus only differs 
