PALAEOPELTIS 205 
anterior part of the exposed surface and none on the margin. 
A movable plate measures 41 mm. long by 22 mm. wide. 
One of the horn-like plates from the cephalic shield is 
35 mm. long, by 30 mm. wide, and has a height of 44 mm. 
GLYPTODONTIA 
This suborder is most sparingly represented, apparently 
on account of unfavorable habitat. Ameghino has de- 
scribed a few fragments of the carapaces of these forms, 
making the genera, Palaeopeltis, and Glypiatelus, both 
pre-Santa Cruz genera. 
Palaeopeltis Ameghino 
Palaeopeltis Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 659. 
The basis of this genus is a few plates of a glyptodon- 
like animal of considerable size, but the plates are without 
ornamentation. This form Ameghino considers inter- 
mediate between glyptodonts and armadilloes. I feel 
that there is too little of the skeleton known to justify this 
conclusion, especially as glyptodonts of a considerably 
higher grade of specialization are contemporaries of this 
form. 
Fig. 134. P.inornatus: a single plate—natural size 
