GLYPTODOirriD-S. 133 



replaced by a rugose zone, ornamented by a number of fine lines 

 radiating from the border of the central disk. 



Hob. South America (Buenos Ayres). 



37559. Several associated fragments of the carapace ; from the 

 Pleistocene of Buenos Ayres, Argentine Republic. These 

 specimens agree very closely with the fragment figured by 

 Burmeister in the ' An. Mus. Buenos Aires,' vol. ii. pi. xx. 

 fig. 7. Barvard Collection. Purchased, 1854. 



43242. Several fragments of the carapace ; from Buenos Ayres. 



Presented by Senor L. J. Fontana, 1871. 



37559 a. Fragment of the anterior portion of a carapace, probably 

 belonging to the present species ; from Buenos Ayres. 



Bravard Collection. Purchased, 1854. 



Hoplophorus (?), sp. c. 



Syn. (?) Glyptodon clavipes, Burmeister ! (non Owen). . 



The following specimens indicate a species apparently nearly or 

 quite as large as Glyptodon reticulatus. The large terminal disks 

 on the lateral surfaces of the tube of the caudal sheath are separated 

 from one another by a row of small disks, and are followed laterally 

 by a series of enlarged disks, which decrease gradually in size as 

 they recede from the tip. The disks on the dorsal aspect of the 

 tube are subcircular in shape, frequently concave, and present great 

 variation in size ; but those on the ventral surface are more regular 

 in this respect. The scutes of the fragment of carapace are oblong, 

 with the grooves very indistinctly marked, and with a series of hair- 

 pits in the groove surrounding the central disk. 



The Glyptodont figured by Burmeister in the ' An. Mus. Buenos 

 Aires,' vol. ii. pi. xxxvi., under the name of Glyptodon clavipes, 

 differs from the type specimen of that species figured by Owen 1 

 in the more elongated and less vaulted form of the carapace, and 

 the straight inferior border of the same, and also in the more elongated 

 scutes, in which the central disks are much less distinctly defined ; 

 in all of which respects it has a much closer resemblance to the 

 carapace of Hoplophorus ormitus, to which species it is referred by 

 Ameghino. The carapace and caudal sheath of that specimen 

 may very probably belong to the same species as the specimens 

 noticed below ; but the cranium, which is like that of Glyptodon, 

 may possibly belong to another form, and the margins of the 

 carapace are perhaps incorrectly restored 3 . 



1 An. Mus. Buenos Aires, vol. ii. pi. xxxvi. (1874). 2 Vide supra, p. 115. 



3 If this cranium really belongs to the same individual as the carapace, it 

 would apparently indicate that the species presents characters intermediate 

 between those of Hoplophorus ornatus and Glyptodon reticulatus. 



