26 



MR.- R. I. POCOCK ON THE EXTERNAL 



absent on the other. In females the excrescence is generally 

 absent or quite small. Only in rare cases of probably aged 

 individuals is it comparable in size to that of the males ; and the 

 elliptical area is genet-ally flat in the females. 



Text-figure 3. 



A. Fore-arm of Lemur catta, newly born, showing the extension of the naked 



skin from the palm of the hand and the elliptical glandular area above the 

 wrist. 



B. Section through the glandular area and the horny spur of the fore-arm of an. 



adult male Lemur catta. 



C. Superficial view of the shoulder-gland of an adult male Lemur catta. 



D. Vertical longitudinal section through the same. 



E. Vertical transverse section through the same. 



F. Section through the shoulder-gland of adult female Lemur catta. 



According to Bland-Sutton the ducts of numerous sweat-glands 

 open upon the surface of the skin of the elliptical area. Secretion, 

 no doubt, exudes through the pores ; but I have never succeeded 

 in squeezing any visible secretion to the surface by pressure. 



The only use I have seen the Lemur make of this structure is. 

 to apply it to the tail by drawing simultaneously the applied 

 wrists along that organ from near the base to the point. 

 Possibly by this means the secretion is wiped on the long hairs 



