124 EDENTATA.. 



by along tube excessively compressed and ending in a point, the 

 smaller scutes being separated from one another, and the enlarged 

 lateral ones of great prominence. The skull and limbs are un- 

 known. 



Euryurus rudis (P. Gervais 1 ). 

 Syn. Glyptodon rudis, P. Gervais 8 . 



This is the type and only species, and is intermediate in si/.e 

 between Panochihus tuberculatus and Dcedicurus 3 . 



Hub. South America (Argentine Eepublic and [?] Brazil). 



M. 3616. Two scutes of the carapace; from the Pleistocene of Buenos 

 Ayres, Argentine Republic. 



Presented by Senor Florentine Ameghino, 1879. 



18651. Fragment of the terminal portion of a caudal sheath, which 



in the extreme prominence of the large lateral tubercles 



agrees with the description of the caudal sheath of the 



present species ; from a cavern in Minas Geraes, Brazil. 



Claussen Collection. Purchased, 1845. 



Genus PANOCHTHUS, Burmeister*. 



The carapace is of great thickness, and composed of quadrangular 

 or pentagonal scutes, each of which in the dorsal region carries from 

 thirty to fifty small tubercles, varying in size from a pea to a nut, 

 the tubercles being separated by grooves. The caudal sheath con- 

 sists proximally of several movable rings, and is terminated by a 

 long, slightly compressed tube ornamented in the same manner as 

 the carapace, but also bearing on its lateral surfaces a few very large 

 tubercles ornamented with a radiate sculpture. The scutes of the 

 carapace are mostly articulated, but a certain amount of movement 

 exists at the peripheral extremities of some of the rows. There is 

 a ventral buckler. The profile of the fronto-nasal region is very 

 convex. There are four digits in each foot, and, according to Ameg- 

 hino, there is an entepicondylar foramen to the humerus. All the 

 species are of very large size. 



1 Comptes Eendus, vol. Ixxxyi. p. 1361 (1878). Glyptodon. 



2 Loc. cit. 



8 The scutes were regarded by Burmeister as belonging to this genus. 



* An. Mus. Buenos Aires, vol. ii. p. 2 (1870-74). 



