217 



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. 

 Euphractus 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^e. 



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*. 



Myrmecophaqa, Linnaeus. 



Fore-feet with four toes ; hind-feet with five toes ; palatine and 

 pterygoid bones united beneath the nasal canal for their whole length. 



M. JUBATA, 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-Umbs 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, tliey 

 rcseml)le those of the larger species in tlieir great extent backwards. 



