VIBRISSiE AND NIPPLKS 



120 



primordia, which sometimes occur on the right 

 or left or both sides, also give origin to 

 vibrissje and not to nipples. The number of 



Fig. 46. — Nipple Development of Squirrel. 

 (Bresslau. ) 



p, dj, flj, and 1, Primary-primordia of pectoral, first and second 

 abdominal and inguinal nipples ; h, accessory nipple primary- 

 primordium with vibrissse ; ir, a, conesponding hair primordia 

 with vibrissse. 



ventral vibrissse varies, therefore, from four 

 to six (Fig. 46). The number of these 

 vibrissae is still larger in some of the exotic 

 9 



