To this genus belongs one of the best known-species of the group, the Six-banded Armadillo or Encoubert (_D. sexcinctus_) of Brazil and Paraguay. A very similar species, _D. villosus_, the Hairy Armadillo, replaces it south of the Rio Plata. There are also two very small species—_D. vellerosus_, from the Argentine Republic and North Patagonia, and _D. minutus_ from La Plata. The latter differs from the other three in having no tooth implanted in the premaxillary bone. Remains apparently referable to _D. villosus_ occur in the Pleistocene cavern-deposits of Brazil. _Xenurus._[105]—Teeth ⁹⁄₉ or ⁸⁄₈, of moderate size and subcylindrical. The most posterior placed a little way behind the anterior root of the zygoma, but far from the hinder margin of the palate. Cranium somewhat elongated, much constricted behind the orbits, and immediately in front of the constriction considerably dilated. Mandible slender; coronoid process very small and sharp-pointed, sometimes obsolete. Vertebræ: C 7, D 12-13, L 3, S 10, C 18. Head broad behind. Ears rather large and rounded, wide apart. Movable bands of carapace 12-13; the scutes being marked by an obscurely granular sculpture. Tail considerably shorter than the body, slender, and covered with nearly naked skin, with but a few small, scattered, dermal bony plates, chiefly on the under surface and near the apex. On the fore feet the first and second toes are long and slender, with small claws and the normal number of phalanges; the other toes have but two phalanges; the third has an immense falcate claw; the fourth and fifth similar but smaller claws. The hind feet are comparatively small, with five toes, bearing small, triangular, blunt nails; the third longest, the first shortest. The best known species of this genus, the Tatouay or Cabasson, _X. unicinctus_, is, after _Priodon gigas_, the largest of the group. It is found, though not abundantly, in Surinam, Brazil, and Paraguay, its remains occurring in the Pleistocene cavern-deposits of Brazil. Others, _X. hispidus_ and _lugubris_, have been described, but little is as yet known of them.