828 SMO DIL S TOK SUNG TAN ES, 
Glyptodon: a very large form that ranged from the southern 
part of South America as far north as Texas and Florida. The 
animal was about six feet long, and reached a height of three 
feet at the most elevated portion of the carapace. The dermal 
plates are sculptured in the form of a rosette. The tail is cov- 
ered with a series of bony rings that are attached to the pro- 
cesses of the vertebre within. 
Panocthus: a \arge form that is confined to southern part of 
South America; very similar to the Glyptodon. The carapace 
was made up of four and five-sided pieces with a tuberculated 
surface instead of the rosette arrangement. The anterior part 
of the tail was protected by 6—7 large bony rings, but the pos- 
terior part was enclosed in a solid tube of bone that was slightly 
flattened; the surface of this tube was covered with small plates 
* that in places gave room to larger ones that seem to have been 
the bases of some sort of protuberance, horny or bony. The 
form reached about the size of a rhinoceros. 
A large number of these forms have been described from the 
late Tertiary deposits of Patagonia, and the Argentine Republic. 
The majority of them come from the Miocene and the Pliocene, 
though a considerable number are from the earliest, the Santa 
Cruz Tertiary. 
Ganodonta..— This group was founded in 1896 by Wortman, 
and considered by him as a suborder of the Edentata. The 
group is made up of a part of the order 77llodontia, which was 
originally considered as the ancestral form of the rodents. Not 
until the teeth of one of these forms was found in connection 
with the fore limb was it determined that they were Edentate in 
character. The fore limbs are similar in every respect to those 
of the Zardigrada, but the teeth are different in that they are not 
devoid of the enamel covering and in the presence of the ante- 
rior teeth, the incisors, and the canines. These forms occur in 
the earliest Eocene Puerco beds of New Mexico, and are 
undoubtedly the earliest forms of the Edentates. They are of 
tScience, December 11, 1896, p. 865., Bull. Am. Mus. Nat. Hist., Vol. IX, p. 59. 
(Contains a full description of the Ganodonta and its geological relationship.) 
