1865.] OF ENTOMOPHAGOUS EDENTATA. 379 
of a Xenurus, judging from the constriction of the brain over the 
orbit ; but the face is very much shorter than in the skulls of XY. 
unicinctus in the Museum Collection. 
C. The dorsal disk only united to the body by the centre of the 
back, free from the hairy skin on the sides. The scapular and 
pelvic shields large, convex, separated by three free central 
rings. Feet weak; front with elongated unequal claws, on the 
tips of which the animal walks; hind feet club-shaped, with 
flat ovate nails; palms and soles covered with plates. Tail 
short. Skull attached to the frontal shield by two or more 
bony prominences. Sphzrochlamydes. 
The animal has the power of bending the body so as to form a 
nearly perfect sphere, the shield on the head and the short tuber- 
cular tail filling up the aperture occasioned by the notches in the 
scapular and pelvic shields. ‘They walk on the small end of the 
elephant-like hind feet, and on the tips of the slender, elongated, 
middle claws of the fore feet. 
9. TOLYPEUTES. 
Head with a flat frontal shield, hinder edge prominent ; ears gra- 
nular. Scapular and pelvic shields large, convex ; central rings three, 
free. Tail short, expanded at the base ; end conical, covered with 
close tesserze ; upper ones very convex. ‘Toes 4 or 5, before and 
behind ; inner and outer small; front claws unequal; two middle 
elongate, large. The hind feet small; toes indistinct, united; claws 
ovate, flat, nearly like the human nail. Skull elongate, slender ; 
nose conical; intermaxillary toothless, with a bony prominence above 
each orbit for attaching the frontal shield. Teeth large. Osteology, 
Cuy. Oss. Foss. v. 123; Turner, P. Z. 8.1851, p. 215. 
Apar, Geoff. Compt. Rend. 1847, xxiv. 572. 
Cheloniscus, Fabr. Column. 
Tolypeutes, Illiger, Prod. 1811. 
. The underside of the body covered with long bristly hairs; the 
outer plate of the moveable rings thin, with a frill of elongate rigid 
hairs on the outer edge. The bodies of the males are less ventricose 
and more elongate than in the female; the hair on the underside of 
the males is grey, in the females it is blackish ; the male organ is 
very large and, when contracted, cylindrical and pendulous. They 
are very active, running with rapidity, but looking very insecure, on 
their slender limbs. They are called “Tatu bola” by the Brazilians. 
* Toes 5/5. Tail conical ; base thick; end broad, flat, truncated ; 
underside flattish. Frontal shield broad and arched above. 
Cheloniscus. 
1. ToLYPEUTES TRICINCTUS. Apar. B.M. 
Frontal shield flat, broad ; the hinder margin not produced above 
