206 THE DESEADO FORMATION OF PATAGONIA 
Palaeopeltis inornatus Ameghino 
P. inornatus Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 659. 
P. inornatus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 506. 
The species is founded on four plates which are without 
ornamentation, and externally smooth except for numerous 
vascular perforations. They are of considerable size and 
entirely characteristic. The one such plate which we found 
is shown in fig. 134. 
Glyptatelus Ameghino 
Glyptatelus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 507. 
The plates of the carapace are similar to those of Pal- 
aeohoplophorus, the O-figure being, however, nearer the 
rear of each plate, and the number of radial furrows being 
smaller, usually six. We found no specimens of this inter- 
esting form. Ameghino has made two species, G. tatusinus 
and G. malaspinensis. 
Glyptatelus tatusinus Ameghino 
G. tatusinus, Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 507. 
I reproduce Ameghino’s figure of this species which 
shows all that is known of the form. 
Fig. 135. Four plates—natural size, after 
Ameghino. 
