1 68 



EVOLUTION AND DISEASE. 



firmatory result ; my own experience as to their 

 frequency coincides with the above statement. As a 

 rule only one extra nipple is found, but occasionally 

 two may be detected. A typical specimen is given in fig. 

 89 : the nipples are situated exactly in the line of the 

 deep epigastric arteries. 



As accessory glands, or nipples, are so frequent in the 

 human subject, it occurred to me that they ought 



FIG. 89. Two supernumerary nipples in a Man. (After Licbtenstem.) 



theoretically to occur in quadrumana. To this end I 

 examined systematically all monkeys coming under my 

 observation, and in a short time secured two well-marked 

 examples. The first was a female macaque (Macacus 

 sinicus] (fig. 90). On the left side, about an inch below 

 the normal gland, an accessory and well-formed nipple 

 was detected ; in size it equalled the normal teats, and 

 was associated with glandular tissue and traversed by 

 ducts. The second monkey came to hand a few months 



