SOME EXTINCT ARGENTINE MAMMALS 95 
patches of minute tubercles, so that this species may be 
spoken of as the tuberculated glyptodon. Doubtless the 
carapace was covered during life by thin horny shields, 
although the marks of these are not generally shown on 
the bone; and from the absence of bristles the creature 
must have been as smooth as the small existing mulita, 
or three-banded armadillo. The tail was much smaller than 
that of the club-tailed species, consisting at the base of a 
number of relatively small rings, and terminating in a tube 
of about a yard in length. This tube lacks, however, the 
terminal expansion and flattening of that of the preceding 
form, while the large discs with which it is ornamented 
take the form of prominent rough bosses, which probably 
carried flattened horny knobs, instead of spines, during life. 
The last representatives of the group to which I shall 
allude are much smaller species from the deposits of 
Monte Hermoso and the Pampas, known as smooth-tailed 
glyptodons, or, technically, Hoplophorus. In these creatures 
the carapace was much more elongated and depressed than 
in the other kinds, while it projected forward on the sides 
of the shoulders in a manner somewhat like that of the 
armadillos. The plates of the carapace show a rosette 
pattern, not unlike those of the ring-tailed glyptodon, but 
they are still smoother, and of an irregular oblong shape. 
As regards the tail, this consisted at the base of a number 
of smooth rings, fitting into one another at their junctions 
like the joints of a telescope, while at the end it terminated 
in a slightly flattened tube ornamented with a number of 
small, smooth oval discs of about an inch in diameter, 
interspersed with which were arranged a few much larger 
but equally smooth and prominent discs along the sides. 
These discs, of all dimensions, were evidently coated with 
smooth scales of horn during life, and, from the absence 
