GLYPTOPOXTID.E 



203 



species are of medium size. Part of a caudal tube from Uruguay 

 described as Eleutherocercus indicates, however, a much larger allied 

 form, in which the tail appears to have had a number of stout bristles 

 protruding from the joints between the scutes. Panochtkus com- 

 prises very large ( ilvptodonts, distinguished by the great thickness 

 of the scutes of the carapace, which are ornamented with tubercles. 

 The termination of the caudal sheath forms a tube bearing large 

 radiated tubercles. Ewrywrus is distinguished by the radiate 

 sculpture of the scutes of the carapace. Dcedicwrus, of which one 

 species was about twelve feet in length, also has a rugose 

 sculpture on the carapace ; but the termination of the caudal tube is 

 expanded into a club-like shape, flattened from above downwards, 



Fig. 69. — Glyptodon clavipes (Pleistocene, South America). From Owen. The tail is incorrectly 

 restored, and it is probable that the figured portion belongs to Hoplophorus. The left lower 

 corner shows an upper and a lower view of the skull, and the right a section of the caudal 

 sheath. 



and covered with tubercles mingled with a few large radiate discs, 

 which, as in Panochthus, probably carried horny spines in the living 

 condition. The typical genus Glyptodon has each scute of the 

 carapace ornamented with a rosettedike sculpture, the peripheral 

 scutes being raised into conical prominences (Fig. 69). The caudal 

 sheath, instead of being like the one represented in the figure, Avas 

 entirely composed of a series of movable rings, ornamented with 

 Large tubercles. The manus had five digits, and the pes four; and 

 there was an entepicondylar foramen to the humerus. A species of 

 this genus, which attained very large dimensions, was made the 

 type of Schistopleurum, on the supposition that the tail of Glyptodon 

 was of the type represented in Fig. 69. The genus ITwroxophorus, 



