202 THE DESEADO FORMATION OF PATAGONIA 
pits, the median lateral plates with rudimentary piliferous 
pits, and the dorsal ones with well marked posterior pits. 
In each succeding row toward the rear, the plates are more 
distinctly ornamented and have larger posterior marginal 
pits. I have no marginal plates. 
The plates of the pelvic buckler do not overlap, are 
shorter, have a very distinct figure, and, in addition to the 
longitudinal furrows, have a couple of radial furrows on 
either side, which divide the plate into four or five areas 
(see fig. 132 a and b). 
The caudal vertebrae are short and thick, indicating a 
short tail. I found no plates which would indicate a caudal 
shield, which coincides. with the experience among the 
Santa Cruz specimens. The figures are to scale and give 
most of the measurements. 
There are ten rows of movable plates, probably two to three rows lacking. 
There are twenty + plates to a row. 
A typical movable plate measures 17 mm. long by 6 mm. wide. 
There were at least four rows in the pelvic buckler, probably eight as in the 
Santa Cruz. 
A typical fixed plate measures 10 mm. long by 5 mm. wide. 
Prozaedius tenuissimus Ameghino 
P. tenuissimus Amegh., 1902, Bol. Acad. Nac. Cienc. Cordoba, t. 17, p. 66. 
This species is characterized by Ameghino on account 
of its small size. The movable plates have two furrows 
which converge toward the front, and between which is a 
median crest. In the furrows are two rows of perforations. 
A movable plate measures 9 mm. long by 4 mm. wide. 
Stenotatus Ameghino 
Euphractus Ameghino, in part, 1887, Bol. Mus. La Plata, t. 1, p.26 of separate. 
Dasypus Amegh., in part, 1889, Act. Acad. Nac. Cienc. Cordoba, t. 5, p. 864. 
Stenotatus Amegh., 1891, Revista Argen. Hist. Nat., t. 1, p. 253. 
Dasypus Lydekker, 1894, Anal. Mus. La Plata, t. 3, p. 55. 
Prodasypus Amegh., 1894, Bol. Acad. Nac. Cienc. Cordoba, t. 13, p. 172 of 
separate. 
Stenotatus Scott, 1903-5 Princeton Patagonian Exped., vol. 5, p. 80. 
The genus is very like Prozaedius but differs in having 
thicker and wider movable plates, in having more rows of 
