ON TOLYPEUTES TRICINCTUS. 
Fig. 3. 
Brain of Xenurus unicinctus. 
441 
Tt is to Professor Owen that we are indebted for our knowledge of 
the great differences between the colic ceca and female generative 
organs of the genera Tatusia and Dasypus. These facts, when taken 
in association with other characters above brought forward and re- 
_ ferred to, may be thus tabulated :— 
Dasypus. Tolypeutes. Xenurus. Chlamydophorus. Tatusia, 
Ears apart. _Fars apart. Ears apart. Ears apart. Ears approximate. 
Nipples 2. Nipples 2. Nipples 2. Nipples 2. Nipples 4. — 
Uterus triangular.| Uterus triangular. | Uterus triangular. | Uterus pyriform. | Uterus pyriform. 
External genitalia | External genitalia | External genitalia | External genitalia | External genitalia 
enormous. enormous. enormous. small in female. | not excessive. 
Glans penis simple.) Glans penis simple. | Glans penis simple. ? “yn aat penis tri- 
o 
Vesiculeseminales| Vesicule seminales | Vesiculz seminales ? Vesiculz seminales 
absent. absent. absent. present. 
Lateral colic ceca | No colic ceca. No colic cxea. Lateral colie ceca | No colic cxca. 
present. present. 
Azygos lobe of| Azygos lobe of | Azygoslobeoflung | Azygoslobeoflung} Azygos lobe of 
lung present. lung present. present. present (Hyrtl). | lung absent. 
Thus we may infer that the genera Dasypus, Tolypeutes, and 
Xenurus resemble one another more than any of them do Tatusia. 
Chlamydophorus, in other respects so different from them all, is 
like Dasypus alone in its colic ceca, like Dasypus, Tolypeutes, and 
_ Xenurus in most respects, and like Tatusia only in the shape of its 
uterus. 
