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G. TUBERCULATUS. 
Ossicles approaching to a square or rhomboidal form, their surface 
divided into numerous irregular elevations. 
The genus Hoplophorus of Dr. Lund appears to be identical with 
Glyptodon ; he figures two teeth in which the characters of that 
genus are clearly shown, and several detached ossicles and portions of 
carapace bearing a general resemblance to the species of Glyptodon, 
principally to the G. ornatus. He distinguishes two species, the H. 
Luphractus and H. Selloi. Prof. Owen refers to the H. Euphractus a 
portion of carapace brought home by Mr. Darwin, and figured in the 
‘ Voyage of the Beagle,’ which very closely resembles those afterwards 
figured in the ‘Catalogue of Fossil Mammalia and Aves in the Museum 
of the Royal College of Surgeons’ under the name G. ornatus. 
I am not as yet acquainted with the Pachytherium magnum of 
Dr. Lund’s catalogues. 
Fam. 3. MyrMEcoPHaGID&. 
The nasal bones simple, of uniform width, emarginated at the 
ends ; the intermaxillary bones much reduced ; the maxillary bones 
much lengthened, toothless, the malar process projecting backwards, 
outwards and downwards ; the posterior palatine foramen single, or 
wanting ; the malar bone reduced to a slender stylet free at the pos- 
terior end; the foramen rotundum included in the foramen spheno- 
orbitarium ; the zygoma very small, and.pushed quite to the anterior 
superior angle of the squamous portion ; the supra-occipital bone en- 
croaches upon the upper surface of the skull, and has a median pro- 
tuberance ; the lower jaw much lengthened and slender at the end, 
without coronoid process. 
Not having seen the skull of the little Two-toed Ant-eater, I have 
used a little caution in characterizing this family. For example, I 
have avoided alluding to the peculiar character of the pterygoids, as 
Cuvier informs us that they do not enclose a long canal ‘as in the 
larger species. I therefore limit the diagnoses of the genera to the 
few points, in which, in the absence of a skull of the small species, 
they are known to differ*. 
Myrmecornaca, Linneus. 
Fore-feet with four toes; hind-feet with five toes; palatine and 
pterygoid bones united beneath the nasal canal for their whole length. 
M. supata, Linn. 
Varied with black and grey, the latter predominating on the head, 
back, sides, fore-limbs and tail; throat, a mark running obliquely 
from the shoulder upwards and backwards, and hind-limbs black ; fur 
very coarse ; tail but little longer than the body, very bushy. 
* I have since seen the cranial portion of the skull of the Little Ant-eater, and 
find that although the pterygoid bones do not enclose the nasal canal below, they 
resemble those of the larger species in their great extent backwards. 
