XENARTHRA. 



547 



plates, not c]i^'i(lod into shields and moveable bands. The bony scutes 

 in front are very thin, but behind they form a strong sliield attached to 

 the pelvis. Vertebrae, C7, DIl, L3, SIO, C15. Limbs short, manus with 

 5 digits ; with bifid caecum ; 2 species. C. truncatiis Harlan, about 



5 inches long, in W. Argentina near IMendoza. Dasypiis L., dentition 

 T^o or f , of which one tooth on each side is in the premaxilla ; auditory 

 bulla complete; vertebrae C7, Dll-12, L3, S8, C17-19 ; carapace with 



6 or 7 moveable bands ; tail short ; manus with 5 digits ; 7 species, of which 

 3 are found in the Pleistocene ; D. sexcinctus L.,the 6-banded armadillo; 

 Xenurua Wagl. (Lysmrus Am.), dentition | or | ; vertebrae, C7, D12-13, 

 L3, SIO, C18 ; carapace with 12-13 moveable bands; manus with 5 digits, 

 of which 1 and 2 are slender and 3 has very large claw ; 5 species. X. uni- 

 cinctus L., the tatouay or cabassou. Priodontes Cuv. {Priodon), dentition 



variable, differing on the two sides, ^^ ; vertebrae, C7, D12, L3, SIO. 

 C23 ; tail long ; carapace with 12-13 moveable bands, manus with 5 digits* 

 claw of third very large ; 1 species. P. gigantetis Geoff, (gigas) (Fig. 285), 

 the largest species of the family, body 3 feet long, eats termites and insects 



Priodontes gigas. 



and is said to uproot newly-made graves. Tolypeutes 111., dentition ^-~ ; 

 vertebrae C7, Dll, L3, 812, C13 ; carapace with 3 moveable bands ; tail 

 short ; manus as in preceding ; can roll up into a ball ; they run qviickly on 

 the tips of their toes ; 3 species. T. tricinctus L., apar. Tatusia Cuv. 

 (Praopv^) dentition \^^, except the last with 2-rooted predecessors, 

 wliich are not changed till the full size has been nearly reached ; verte- 

 brae C7. D9-11, L5, S8, C20-27 ; carapace with 7-9 move Me bands; 

 manus with 4 visible toes, the 5th being small and concealed ; with 2 

 inguinal mammae in addition to the pectoral pair, produce 4 to 10 young 

 at a birth, about 12 species ; T. novemcincta L., peba. Vetelia Am., 

 Eocene, Patagonia ; Propraopus Am., PHocene, Argentina, are extinct 

 genera aUied here. Scelopleura A. M. Edw. Brazil, plates on the back 

 deficient. Extinct genera are Chlamydotherium Lund., Oligocene to 

 Plei tocene, as large as a rhinoceros ; Eutatus P. Gervais, Pliocene ; Dasy- 

 potherium, etc. 



Fam. 7. Glyptodontidae. Extinct, sometimes gigantic, armadillo- 

 like animals with a rigid carapace formed of a great number of bony 

 scutes joined together and not divided into sliields and bands ; dentition f, 

 teeth with two deep flutings on each side ; zygoma with descending process 

 from the maxilla ; dorsal vertebrae ankylosed and some of the cervical ; 



