1878.] MR. A. H. GARROD ON TOLYPETJTES TRICINCTTTS. 



229 



In Xenurus unicinctus the vesiculae seminales are not present, the 

 distal ends of the ureters being enlarged. Cowper's glands and a 

 prostate are present ; and the apex of the glans penis is not trilobed 

 as in Tatusia, but simple, as in Dasypus and Tolypeutes. The 

 penis itself is huge. In Tolypeutes, according to Dr. Marie, the 

 vesiculsB seminales are also absent. 



In Tatusia peba and T. hybrida the vesiculfe seminales are laro-e, 

 and there is a pair of lateral lobes to the apex of the glans penis. 

 The whole penis is proportionally smaller in Tatusia than it is in 

 Dasypus, as is the clitoris. In these respects Tolypeutes and Xenu- 

 rus agree with Dasypus, my experience being, as far as the male 

 organs of Dasypus are concerned, confined to D. sexcinctus. 



In Dasypus, Tolypeutes, and Xenurus there are only a pair of 

 nipples, in Tatusia there are two pairs. In Xenurus unicinctus 

 the uterus is triangular, as in Dasypus and Tolypeutes. 



Fig. 3. 



Brain of Xenurus unicinctus. 



The brain of Xenurus is intermediate in its form and surface- 

 markings between Dasypus and Tolypeutes. The hemispheres, when 



