198 



and clothed with black hair, and the cheek immediately below and behind the 

 eye shows slight pigmentation. The external ear is pigmented on both aspects. 

 The ventral surface of the body lacks pigment, but the dorsum of the trunk 

 and the limbs are pale blue-grey. The tail is more strongly pigmented at the 

 base than at the tip. The black and white colouration of the hair, the absence 

 of any suggestion of band markings, and the bluish pigmentation of the skin 

 increase the great unlikeness to the rufus adult which the young animal displays 

 in its general form. 



Hair Tracts. — The arrangement of the coarse hispid hair in the fully-haired 

 young is extremely simple. On the muzzle, face, head, trunk, and tail the slope 

 is uniformly caudad. Upon the hind limb the slope is distal and post- 

 axial. Upon the humeral portion of the fore limb it is post-axial, but 

 upon the forearm it is post-axial and proximal in direction ; there being, 

 therefore, a slight tendency to converge in the region of the elbow (see fig. 1). 

 The slight proximal trend of the hairs on the forearm constitutes the only trivial 

 exception to the otherwise caudad, distal, and post-axial direction of the hair. 



Vibrissac and Papillae. — The sensory papillae and vibrissae are undoubt- 

 edly undergoing reduction. The facial vibrissae are sparse and poorly repre- 

 sented, and have no marked papillae for their origin. The only papillae which 



Fig. 6. 



Myniiccobius fascia fits. 



Left manus of specimen 75 mm. 



maximum H.B. length. Note the 



ulnar carpal papilla and its four 



vibrissae. 



Fig. 7. 



Myrmccohijis fasciatus. 



Left pes of specimen 75 mm. 



maximum H.B. length. 



reaches any degree of prominence is the ulnar carpal (see fig. 6), and this wanes 

 as development proceeds, even its vibrissae being unrecognizable in the adult. 

 Vibrissae are present in the 23 mm. R.V. embryo when the scalp hairs are 

 appearing; in later stages they are more difficult to recognize owing to their 

 likeness to the hispid hairs of the general body covering. 



