CHEIROPTERA. 15 



The fossil having been thus brought to a particular 

 section of the unfoliated or simple-nosed Bats, its affinity 

 to some particular genus or species of this family remained 

 to be considered. The Barbastelle, the Pipistrelle, and the 

 Noctule, offer three modifications of the anterior upper 

 premolar ; * it is rudimental, hardly discernible in the first, 

 of large size and more outwardly situated in the second, of 

 intermediate size but not visible from the outside of the 

 jaw, in the third species. The fossil comes nearest the 

 Noctule in this character. The canines and large molar 

 teeth afford no grounds of discrimination amongst these 

 genera. 



The skull, by the somewhat greater length of the cranium 

 and its strong sagittal crest, confirms the indication given by 

 the teeth and the heel-spine of the affinity of the fossil or 

 pseudo-fossil to the true Vespertiliones, and herein, more es- 

 pecially to the Great Bat of Pennant (VespertiUo noctula), 

 the first of the British existing species described by Pro- 

 fessor Bell. 



RHINOLOPHUS FERRUM-EQUINUM. 



From amongst the more fragmentary fossils of Cave 

 Cheiroptera, I select a ramus, or half lower jaw (fig. 6) with 

 the coronoid process broken off, but with 

 the series of teeth perfect, since these F & 6 ' 



manifest characters which indicate not only K 



(\ \f\ \ ^ t 



a species of Bat distinct from the preceding, 



but, likewise, one that belongs to a different 



section of the order. There are two false molars in this 



lower jaw, as in the VespertiUo Noctula, but of different 



* The " molares spurii," or " false molars," " bicuspides," in Human Anatomy ; 

 they are situated before the true molars, between these and the canine. 



