1294 CLASS MAMMALIA. 



subcylindrical tube (fig. 1164), ornamented with a number of large 

 disks, surrounded by a series of much smaller ones. It is con- 

 sidered probable that the caudal tube represented in fig. 1162 

 belongs to this genus. The humerus has an entepicondylar foramen, 

 and there are four complete digits to each foot. An allied form, 

 from the infra-Pampean of Patagonia, has received the name of 

 Palcehofilophorus ; while the terminal tube of a caudal sheath from 

 Uruguay has been made the type of the genus Eleutherocercus. 

 The latter specimen is characterised by its loose attachment to the 

 enclosed vertebrae, and by the great number of perforations for 

 bristles, so that the tail of the living animal must have resembled 

 a huge bottle-brush. The genus Panochthus is characterised by the 



Fig. 1164. — The incomplete terminal tube of the caudal sheath of Hoplophortis ; from the 

 Pleistocene of South America. One-third natural size. 



excessive thickness of its carapace, the scutes of which are tubercu- 

 lated, and by a caudal sheath composed proximally of several 

 movable rings, but terminating in a long compressed tube orna- 

 mented with tubercles, of which some were of very large dimensions, 

 and marked with a radiate sculpture. In Euryurus the caudal 

 sheath is of somewhat similar type, but the scutes of the carapace 

 are simply rugose. Dcedicurus, again, also has the scutes of the 

 carapace rugose, but the terminal tube of the caudal sheath is 

 enlarged into a flattened club-like expansion, covered with coarse 

 tubercles, interspersed with a few larger rough disks having a radiate 

 sculpture ; these disks having probably been surmounted, as in 

 Panochthus, with horny epidermal spines. The type species at- 

 tained a length of about 12 feet. Finally, in Glyptodo?i (fig. 1162), 

 with which Schistopleurum is probably identical, the scutes of the 

 carapace had a rosette-like sculpture, the peripheral ones being 

 raised into conical prominences, and the caudal sheath, at least 

 in several species, was entirely composed of a series of movable 

 rings, ornamented with large conical tubercles. The humerus was 

 devoid of an entepicondylar foramen ; and while there were five 

 complete digits in the manus, those of the pes were reduced to four. 

 Thoracofihorus differs from all the foregoing in having the scutes of 

 the carapace separated from one another, and thereby approximates 



