624 COMPARATIVE ANATOMY. 



Cowper's glands are connected with the portion which is enclosed 

 by the erectile bodies. These are not always present (Cetacea, 

 Carnivora). In the female they open into the vestibulum vaginas 

 (glands of Duverney or Bartholin). The glands of the prepuce 

 (Tyson's glands) are developed into large organs in many Mam- 

 mals, and especially in the Rodentia, among which they are best 

 developed in Castor (Fig. 353, t). 



