116 PROP. E. RAY LANKESTER ON HAIR-FRINGES AND [Feb. 5, 



face — between the two lateral horn- sacs, also between the eyes and 

 above the eyes, which are carefully represented in the coloured 

 drawing (Plate Y.) of the face of the foetal Giraffe. I observed 

 similar but more strongly marked and broader bands of alternating 

 reddish-brown and paler colour between the nostrils (see Plate Y. 

 and also text-fig. 30, supra, p. 106) and at the side of the upper 

 lip, on the front of the lower jaw and below the eye (text-fig. 37, 

 p. 115). 



The colour-bands between the horns and the eyes varied in 

 intensity according to the angle of the incident light, and could 

 be temporarily destroyed by pressing the skin and smoothing 

 down the hair. After careful examination of the hairs, I came 

 to the conclusion that there was no actual difference of colour in 

 the hairs occupying the darker stripes and those placed on the 

 lighter tracts, but that the phenomenon was due to the existence 

 of parallel linear depressions or wrinkles the existence of which 

 was made obvious by a transverse section of the integument 

 (text-fig. 38). The hairs are crowded together in the trough of 

 the wrinkle, and further apart in the convex intermediate areas. 

 That "wrinkling" could produce such an impression of dark and 

 light banding was demonstrated by the casual folds and wrinkles 

 of the integument on the legs, and by purposely producing such 

 wrinkles by pressing or folding the hairy integument. 



Section across three dai'k-coloured bands above the eye of the f cetal Giraffe, showing 

 three longitudinal furrows or depressions in transverse section corresponding to 

 the dark bands. Magnified. 



Nevertheless I could not attribute the colour-banding to a 

 mere accidental or casual formation of wrinkles. Their definite 

 form and arrangement precludes such an explanation. They 

 appeared to me to be the expression of a definite structural 

 condition. Moreover, immediately over the eyes and on the 

 snout the difference of colour of the alternating bands was very 

 strong, the darkly-coloured stripes being of a strong reddish- 

 bi'own tint and the intermediate bands quite pale ; and in this 

 case a pigment was present in the hairs of the darker stripes 

 which was not so richly developed in those of the lighter 

 neighbouring stripes. I found, on microscopic examination of 

 the hairs, that they could be roughly divided into three sizes ; 



