114 EDENTATA. 



18638 C. Several first and second phalangeals. 



18638 d, e. Two specimens of the terminal phalangeal of the third 

 digit of the manus. These specimens agree with the 

 corresponding bone figured hy Eeinhardt, op. cit. pi. iii. 

 fig. 4. 



18638 f. Part of a rib. 



18640. The distal extremity of the right radius. 



18641. The proximal extremity of a radius. 



18642. Two fragments not improbably belonging to the humerus. 



Family GLYPTODONTID^. 



The teeth are f in number, and have two deep grooves on either 

 side, dividing them into three nearly distinct lobes. The facial 

 part of the cranium is extremely short, and there is a long descend- 

 ing maxillary process in the zygoma. The vertebral column is 

 almost entirely anchylosed into a long tube, but has a complex joint 

 at the base of the neck. The carapace has no movable bands, and 

 is composed of polygonal or quadrangular bony scutes, which are 

 usually united by suture into a solid buckler, but are occasionally 

 (Thoracophorus) separate ; there is usually a ventral buckler, or 

 plastron ; and the caudal region is enclosed in a complete bony sheath. 

 The scutes of the carapace may be either tuberculated, sculptured, 

 or plain : when sculptured the pattern is either simply radiate, or 

 in the form of a rosette consisting of a central elevated disk, 

 surrounded by several peripheral disks, the disks being separated 

 by grooves which vary in depth in the different genera : the disks 

 themselves may be either plain or sculptured. There is no third 

 trochanter to the femur ; and the feet are short and stout. The 

 csrebrum is relatively much smaller than in the Dasypodidce. 



Genus GLYPTODON, Owen \ 

 Including Schistopleurum, Nodot 2 . 



The scutes of the carapace are articulated, usually of great 

 thickness, polygonal in form, and in the larger species with from 

 five to seven peripheral disks 3 ; the anterior lateral scutes are not 



1 In Parish's 'Buenos Ayres and La Plata,' p. 1786 (1838). Many copies 

 of this work belong to an issue dated 1839. 



2 Comptes Rendus, vol. xli. p. 336 (1855). 



3 Some of the scutes mentioned under the head of species a have from ten to 

 twelve peripheral disks. 



