404 W. G. RIDEWOOD. 



not differ fi'om these in any essential respect. They have a 

 fairly thick cuticle, but no medulla. They are broadest at 

 about one sixth of their length from the free end, and in this 

 part the cortex is coloured brown by numerous granules ; 

 whereas in the basal half or more these are wanting, and the 

 hair appears quite clear, with just an odd air vacuole here 

 and there. 



The scaling of the cuticle is very strongly marked on the 

 basal part of the hair, but in the pigmented portion it is less 

 easy to distinguish. In the fine hairs of the under-fur the 

 cuticular scaling is the most obvious feature. The greatest 

 width of the larger hairs is 70 /u ; that of the supplementary 

 hairs 20 /x. There is, however, no rigid distinction between 

 the two kinds of hair, and transitional forms are fairly 

 common. 



C h 1 a m y d o p h o r u s t r u n c a t u s. 



The soft fur of Chlamy dophorus is made up of fine 

 non-medullate hairs, the average breadth of which is 17 /x. 

 The cortex is transparent and unpigmented, and contains 

 only a few scattered granular markings. The scales of the 

 cuticle project considerably, and give a ragged appearance to 

 the surface of the hair (fig. 17). 



Dasypus sexcinctus and villosus. 



In both species the hairs are coarse, brown, and oval in 

 section. When examined from the side they show a fine 

 and close longitudinal striation, due to the arrangement of 

 highly refracting granules in fusiform series. The cuticular 

 scaling is close, and can be made out only with difficulty. 

 In Dasypus villosus (fig. 19) the section is less perfectly 

 oval than in Dasypus sexcinctus (fig. 18), since it tends 

 rather towards the rectangle in shape. There is a distinct 

 slit-like medullary cavity in D. villosus, but this is wanting 



