206 THE DESEADO FORMATION OF PATAGONIA 



Palaeopeltis inornatus Ameghino 



P. inornatus Amegh., 1895, Rol. Inst. Geog. Argon., t. 15, p. 659. 

 P. inornatus Amegh., 1897, Bol. Inst. Geog. Argcn., I. 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. Argcn., t. 1 8, 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. 



