174 SKULL OF ARMADILLOS CHAP. 



half jaw, of which one is often implanted in the premaxilla. 

 The Armadillos show their alliance with the other American 

 Edentates in the points enumerated above. Their teeth specially 

 ally them to the Sloths, while the salivary and digestive organs 

 generally are on the Anteater plan, but present a less extreme 

 development. There are, however, caeca, paired as in birds, in 

 the genera Dasypus and Chlamydophorus. The others have none. 

 But there is a dilatation at the commencement of the large 

 intestine, which is not very different from the slightly-developed 

 caeca of Dasypus. 



There are certain peculiarities in the skeleton, which dis- 

 tinguish this family. 



The skull in the Armadillos presents a number of likenesses 

 to the other American Edentates. 1 The premaxillaries are 



*& 



FIG. 99. Skull of Armadillo. Dasypus seed itctus. x f . ex.oc, Exoccipital ; //, 

 frontal ; max, maxilla ; 'IMS, nasal ; par, parietal ; peri, periotic ; p.max, pre- 

 maxilla : s.oc, supraoccipital ; sq, squamosal ; ty, tympanic. (From Parker and 

 Has well's Zoology.) 



small, but are larger in Dasypus than in Tatusia. On the other 

 hand the lachrymals are larger in the latter. The zygomatic arch 

 is complete, but there is no downward process as in the Sloths. 

 In Tatusia (but not in Dasypus} the " short thick pterygoids add 

 somewhat to the hard palate." This is clearly a beginning or a 

 remnant of the quite crocodilian character of the palate of 

 Myraucophaga. In the cervical vertebrae we see the Whale-like 

 character of fusion between individual vertebrae ; and also, as 

 in the Whales, the degree to which this fusion is carried out 



1 For the anatomy of several forms, see Garrod, Proc. Zool. Soc. 1878, p. 222, 

 who quotes other memoirs. 



