'"layx'] PK'OC'EEDINGS OF THE NATIONAL MUSEUM. 9 



lagos ;ii'o clcKsoly cnwi'iipped by iii(t>j>'iiiiuMit and the traj^iis is abisent. 

 In such an car the tciins intxr and oKfcr borders and //^>, exhaust the 

 list which are <leniand(Ml in their (h'scrii)ti()n. In the ears of the re- 

 maining" taniilies it is Car ditlerent. The aurick' here is ex[)anded to 

 degrees which bring the outer parts to a greater or less degree down- 

 ward and Ibrward on the upper parts of the neck and reach tlie region 

 of the mouth, or even the chin, while the inner border, being giuirded 

 by a skill fold wliich connects the ear to the crown, is disposed to bo 

 united with the corresponding part of the eai' of the opposite sid(^ and 

 extend in varying degrees toward the sin)ut. Skin la-p[)ets arise from 

 both inner and outer borders. Those from the inner bordi'r from a 

 long appendage which lies in advance as detined in the simple ear and 

 hecomcs the internal lion. As a rule it ends as a free lobe inferiorly, 

 which thus becomes the mternal banal lobe. The line of the true inter- 

 nal border being always discernible be<'omes the internal ridge. The 

 external border, which is distinguisluMl from the true external lnuder 

 which now becomes the external ridge is also disposed to form a hem 

 {external hem), which, however, in contrast to the inner is ai)t to be 

 divided into an upper and a lower part; the upper part forms tlu^ Jlrxt 

 scallop^ and the lower the second scallop. The free lower end of the 

 outer border becomes the cvternal basal lobe, which may be separated 

 from the lower scallop by a deep basal notch, or the second scallop nuiy 

 extend across this notch and the external basal lobe and becomes con- 

 tinuous at various distances with the fai'e or that over the lower Jaw. 

 These parts will not receive distinctive names. In most examples the 

 auricle is also conveniently divided into an anterior and a posterior 

 part, the anterior part is marked, if marked at all, by lines repeating 

 that of the internal border, while the jwsterior part is marked, if 

 marked at all, by conspicuous transverse lines or stria'. The hair 

 when it extends upward on the ear from the crown is usually of tlie 

 color and character of that of the crown, while that of the posterior is 

 of the color and character of that of the neck. 



The traf/ns varies exceedingly in form. The following terms are em- 

 ployed in its description, viz, the inner and outer border, the tip, the 

 notch, which is near the base of the outer l)order, and the basal lobe, 

 which lies below the notch. The tragus is said to be absent in I'tero- 

 pida^ and Rhinolophidjc, but in vsome examples of the family last named 

 arudimental tragus can be discerned. The tragus always arises from 

 the ridge which lies in front of the auditory meatus and connects the 

 inner and outer auricular borders. It is of interest to observe that 

 while this connection with the borders is imperfectly defined in nu)st 

 bats that in the recently discovered Eudernia it is markedly so united 

 and tends to constrict the basal parts of the enormous auricle. 



Not only is this the case, but the ears are often united by a band 

 {inter auricular membrane) which extends obliquely forward. In Cory- 

 norhinns and ]\[aerot>is it is on the face, and in Promops perotis nniches 

 (piite to the snout. 



