HEAD OF THE COLLARED BAT. 



This bat is interesting in so far as it occupies a place intermediate between the 

 bats that have six senses and those which have only five. The sensitive membrane 

 is very small and projects from the neck ; the face is provided with wart-like 

 formations each of which is covered with sensitive hairs. The sixth sense is of 

 very little use to this animal, but it is provided with fairly large eyes. 



HEAD OF BLAINVILLE'S BAT. 



In this bat, we have the highest development of the organ of the sixth sense to 

 be found anywhere in animated nature. The whole face, including the ears, is 

 covered with this organ ; the nose, ears and chin, are all occupied and covered 

 with sensitive hairs. The eyes are small and of very little use. 



13 



