330 GEORGINA SWKET. 



wide flattened part, which iu a typical hair at a distance of 

 1 mm.; from the tip is "09 mm. wide. From this point down- 

 wards we find a diminution in size till at its exit from the 

 follicle it is round, and '03 ram. in diameter. The tip is 

 solid, but in the wider shield and long smooth shaft, the 

 medulla is much vacuolated; the air cavities become regu- 

 larly arranged, so as to give the ladder-like appearance at 

 about 2 mm. below the extreme point. There is no pigment 

 iu the older hairs, though in the successional large hairs 

 there is pigment in the centre of the flattened shield. 



In the ischiotergal patch, however, these large hairs are 

 much pigmented right to the free end, causing the darker 

 colour of this area. The tip, moreover, instead of being 

 smooth and pointed as elsewhere, is deeply split (PI. 19, figs, 

 9 and 10), giving rise to a somewhat brush-like appearance 

 at the end of each hair. These are frequently '1 mm. in 

 width just below the division. 



The small hairs are imbricated all over (PL 19, fig. 7), and 

 taper gradually from base to tip over the general surface, 

 but in the ischiotergal region (PI. 19, fig. 8) they are irre- 

 gularly waved near the tip, somewhat resembling a badly 

 made spear. 



The roots of both large and small hairs are situated at 

 about the same level in the dermis. In minute structure the 

 hair sheaths, as well as the hairs, are normal. 



The long straight hairs found around the cloacal opening 

 in both male and female are in distinction to those of the 

 rest of the body surface, not disposed in bundles, but are 

 isolated. In diameter they average 'O-l? mm. to '05 mm. 



Special Cutaneous Structures. 



When examining the epidermis over the region of the 

 rudimentary eye, I found curious modified groups of epidermic 

 cells with a more or less definite arrangement ; and, on further 

 investigation, they are met with over most of the head region. 



