XEXARTHRA. 547 



plates, not divided into shields and moveable bands. The bony scutes 

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

 the pelvis. Vertebrae, C7, Dll, L3, S10, C15. Limbs short, manus with 

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



5 inches long, in W. Argentina near Mendoza. Dasypus L., dentition 

 j'j or | , 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 

 Xenurus Wagl. (Lysiurus Am.), dentition f or f ; vertebrae, C7, D12-13, 

 L3, S10, CIS ; 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. (Priodori), dentition 

 variable, differing on the two sides, |j=|- ; vertebrae, 07, D12, L3, S10. 

 C23 ; tail long ; carapace with 12-13 moveable bands, manus with 5 digit 8 ' 

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

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



FIG. 285. Priodontes 



and is said to uproot newly-made graves. Tolypeutes 111., dentition 9 -y-^ ; 

 vertebrae C7, Dll, L3, S12, C13 ; carapace with 3 moveable bands ; tail 

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

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

 (Praopus) dentition |^-|, except the last with 2-rooted predecessors, 

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

 brae C7, D9-11, L5, S8, C20-27 ; carapace with 7-9 moveable 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 ; Propraoptis Am., Pliocene, Argentina, are extinct 

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

 deficient. Extinct genera are Chlamydotherium Lund., Oligocene to 

 Pleistocene, 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 shields 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 ; 



