a66 



and stiff vibriscae arise. These vibriscae are pale in colour 



and are conspicuous features even in adults. Upon the 



ulnar margins of the arm, but more upon its dorsal aspect, 



are two other papillae, 

 each of which gives rise 

 to a single tactile hair. 

 Of these the lower (most 

 distal) one is situated at 

 about the mid-point of the 

 fore-arm upon its lateral 

 aspect. It is here termed 

 the medial antebrachial 

 papilla (B). The other is 

 situated nearer to the 

 point of the elbow, and is 

 here termed the anconeal 

 papilla. Both of these 

 papillae are constant, and 

 the pale stiff vibriscae 

 which spring from them 

 are conspicuous when the 

 animal is clothed with its 

 general body hair. They 

 are readily identified in 

 dried museum specimens. 

 Crural Vibriscae. — Upon the mesial aspect of the ankle, 



just behind the mesial maleolus, is a large papilla which gives 



rise to two long and stout tactile hairs. These vibriscae are 



constant and easily identified 



in the adult. They are quite 



distinct in skins prepared for 



museum use, and are here 



termed the calcaneal vibriscae 



(see fig. 5). 



Cloacal Vibriscae. — A 



group of long bristle-like hairs 



is present around the cloacal 



margin in both sexes. These 



hairs are conspicuous in the 



adult, but they make their 



appearance later than the 



other tactile hairs, being pre- 

 sent only when the general 



body hair has become well 



developed. 



Rhinarium.. — The rhinarium is triangular in form (see 

 fig. 6). The superior surface is cleft by the upward 



Fig. 5. 



Calcaneal vibriscae (from Specimen 



female B, Perth Museum). 



Fig. 6. 



Rhinarium embryo 100 mm. 



(Specimen female B, Perth 



Museum). 



