198 EDENTATA 
rounded inner border to a sharp, outer, and inferior edge. The 
hind foot rather short, with all five toes armed with stout, 
compressed, slightly curved, obtusely pointed claws—the third the 
longest, the second nearly equal to it, the fourth the next, the first 
and fifth shorter, and nearly equal. 
To this genus belongs one of the best-known species of the 
group, the Six-banded Armadillo or Encoubert (J. 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 pre- 
maxillary bone. Remains apparently referable to D. villosus occur 
in the Pleistocene cavern-deposits of Brazil. 
Xenwrus.—Teeth $% or 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. Vertebre: C7, D12-13, L3, 810, C18. 
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 Cabassou, _V. 
unicinetus, 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. 
Priodon.2—Teeth variable in number, and generally differing on 
the two sides of each jaw, usually from 20 to 25 on each side 
above and below, so that as many as 100 may be present alto- 
gether ; but as life advances the anterior teeth fall out, and all 
traces of their alveoli disappear. The series extends as far back as 
the hinder edge of the anterior root of the zygoma. The teeth are 
1 Wagler, Syst. Amphibien, etc., p. 36 (1830). 
° FP. Cuvier, Hist. Nat. des Manvmiferes (1822).—Priodontes. 
