422 M. Lund on Fossil Mammifera discovered in Brazil, 



XLVII. — lAst of Fossil Mammifera from the Basin of the Rio 

 das VelhaSy with an extract of some of their distinguishing 

 Characters, By Dr. Lund*. 



Edentata. 



M. Lund describes a Myrmecophaga of the size of an ox {Myrm. 

 gigantea.)\. 



Effodientia. 



Two species ofDasypus; one allied to D. octocinctus, but with the 

 mouth shorter ; and the other twice as large as the living species, 

 with the plates of the shield deeply punctuated (D. punctatus). 



Xenurus, Wagl. A species allied to X. nudicaudis, a living species 

 established by M. Lund. 



Eurodon, Lund. An extinct genus of Armadillo, characterized by 

 the teeth being transversally compressed. M. Lund is only acquainted 

 with a single species, of the size of a small pig. 



A Heterodon, Lund., another lost genus of the same family, distin- 

 guished from all the living Armadillos by the proportion of its teeth : 

 the species which served as the type was of the size of a rabbit. 



A Chlamydotherium, Lund., a new genus of the same family. 

 Nearly all the parts of the skeleton have been investigated by the 

 author, and it proves to be very interesting from its establishing con- 

 nexions between the various groups of existing Armadillos, and also 

 by the affinities it presents to the Bradypoda. 



The Chlamydotherium represents on a grand scale the genus Eu- 

 phractus, Wagl. M. Lund is acquainted with two species, one de- 

 dicated to M. von Humboldt of the size of a Tapir ; the other, named 

 giganteum, equaled in size the largest Rhinoceros. 



An Hoplophorus, a genus very extraordinary from the heavy pro- 

 portions of its species and their gigantic size, as well as from the re- 

 markable combination of different types of organization : their cha- 

 racters however bring them more and more near to the Bradypoda. 

 These curious animals were provided with a shield, which covered all 

 the upper parts of the body, and which consisted of small hexagonal 

 plates, except towards the middle of the body, where these plates 

 take a square form and are arranged in fixed transversal bands. The 

 bones of the trunk as well as the large bones of the extremities are 



* From an extract given by Victor Audouin, to whom the letter was ad- 

 dressed, in the Comptes Rendus, No. 15, Avril 1839. The first or introduc- 

 tory part of this paper appeared at p. 235 of the present volume. 



t Among the fossils brought to England from South America by Mr. Dar- 

 win there is a fragment of the cranium of an animal as large as an ox, and 

 which Mr. Owen has described under name of Glossotheriurriy considering it 

 to have had the same habits and food as the Anteaters, to which it was very 

 closely allied, but not generically identical. — Ed. 



