364 



Sensory Vibriscae. — In ontogenetic sequence the first of 

 these vibriscae to appear is the ulnar carpal tuft, which is 

 present as an elevated cutaneous papilla before any visible 



Fig. 2. 



Hair tracts of Specimen 



male D, Perth Museum. 



The auricle is cut off close 



to the head. 



hair springs from ' it. This papilla is conspicuous at the 

 32 mm. stage. All the remaining papillae and their accom- 

 panying vibriscae are well developed at the 65 mm. stage. 



