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T. HYBRIDA. 
Ears about one-fourth of the length of the head; plates of the 
pelvic shield convex and elevated ; tail about two-thirds of the length 
of the body. The characters of this species, which was named by 
M. Desmarest, are carefully pointed out by Mr. Martin in the ‘ Pro- 
céedings ’ of the Society, January 1837. 
Cuvier speaks of a third species brought from Brazil by M. de 
Saint-Hilaire, under the name of Tatou verdadeiro, differing from 
the mule Armadillo in having the tail terminated by a horny sheath 
of one piece, the bands broader, and the plates of the pelvic shield 
larger. 
Dr. Lund figures two ossicles of a Tatusia, indicating dimensions 
much greater than those usually attained by specimens belonging to 
the genus, and applies the name Dasypus punctatus. I find in the 
Museum of the College of Surgeons a recent carapace, denuded of its 
horny epidermal scutes, and wanting the scapular shield; it is as 
large as Dr. Lund’s figures would imply, and has the same punctate 
depressions in the grooves which mark the surfaces of the component 
ossicles. It differs from a smaller one, still a large specimen, also 
denuded of the epidermal scutes, in the latter having the central area 
of each ossicle a little elevated at its posterior margin, and the punc- 
tate depressions fewer and smaller behind this area than in front of 
it ; while in the larger specimen they are all about equal in size. 
It is difficult to compare these specimens with those which retain 
their natural covering ; but the punctate character seems to belong 
to the genus rather than to the species, it not being perceptible until 
the horny scutes are removed: and whether the Tatusia punctata 
be a species, or merely a large variety of one of the others, it would 
appear not to be extinct. 
Cuiamypuorvus, Harlan. 
Plates of the head, the scapular shield and the body forming an 
uninterrupted series, each a parallelogram, those of the neck smaller, 
and those of the muzzle irregular ; pelvic shield small, flat, or slightly 
convex, placed vertically, at right angles to the dorsal armour, and 
composed of concentric semioval rows of trapezoid plates ; fore-feet 
with five toes, the medius being the longest, the two inner claws the 
smallest, and the three outer ones very deep and compressed ; frontal 
bone with a large thickened process above the eye ; malar bone thin, 
deep anteriorly, with a rudiment of a descending masseteric process 
assuming a transverse position ; auditory process bending forwards 
round the base of the zygoma ; lower jaw with the ascending ramus 
much elevated, the condyle higher than the coronoid process. 
C. truncatus. 
Dasypvus. 
Head broad behind, ears wide apart, its plates.irregular, marked 
like those of the body ; those of the scapular and pelvic shields ob- 
long parallelograms, like those of the bands, but becoming penta- 
gonal or hexagonal towards the neck and croup—all the plates 
