213 



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- 

 ceedings ' 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. 



Chlamyphorus, 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 descendmg 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. 



Dasypus. 



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 



