272 Miscellaneous. 



With regard to Toxodou, he is able to add new details to those 

 which we possessed upon this gigantic Mammal, the affinity of which 

 with the Porcine Mammals now appears to him beyond doubt. Its 

 habits must have been similar to those of the Hippopotami ; but the 

 singularity of its characters, which, however, are not foreign to 

 those which distinguish those great Pachyderms of the Old World, 

 must indicate more intimate allies stUl unknown. 



The Jumentes have no well-marked representatives among the 

 fossils of the region of La Plata, except the Horses known as Hi^)- 

 pidia. With these, no remains of Tapirs have been found ; but a 

 fragment of a mandibular symphysis, still bearing the traces of two 

 canines between which two incisors were implanted, would seem to 

 indicate an animal resembling the Rhinoceroses, at least as regards 

 this part of its dental formula. 



A large Maehairodus, resembling in its size and the great develop- 

 ment of its upper canines the Brazilian MacJmlrodiis neogceus (Fdis 

 smilodon, Blainv.), nevertheless seems to form a distinct species, 

 judging from differences in the form of the skull, and the number of 

 its lower molars, of which there were only two, instead of three. It 

 may be called Maehairodus necator. M. Larroque has the skeleton 

 of this animal nearly complete. 



A more complete comparison of the carapaces of several species of 

 Glyptodonts, and of certain parts of the skeleton of these animals, 

 confirms their separation into several genera proposed by Burmeister, 

 and shows that the number of species was certainly more than ten. 



One of the Glyptodonts previously brought over by M. Seguin 

 has not yet been described. Its bony plates are quadrangular, rough 

 on the outer surface, but without rosaciform tubercles, and without 

 rays. The rings of its caudal sheath are formed of separate pieces, 

 the interlockings (guiUocJmres) of which resemble those of the dorsal 

 pieces. This Glyptodont, of which the cephalic armature has also 

 been brought, will no doubt constitute a distinct genus. It was 

 discovered in the province of Santa-Fe ; and the author for the pre- 

 sent gives it the name of Qlyptodon rudis. 



Another undescribed species is more allied to Hoplophorus, but 

 differs from the known species of that genus by its plates, which 

 are composed of a smooth central disk of polygonal form with very 

 blunt angles, and bearing on its sides smaller smooth plates in the 

 form of arcs of a circle. This Hoplophorus, of which only a small 

 fragment is known, is named by the author H. discifer ; it is in M. 

 Ameghino's collection. 



The author adds that M. Ameghino has brought home a consider- 

 able number of objects of human workmanship, both in bone and 

 stone, produced by the first inhabitants of the Argentine Territory, 

 Some of these specimens appear to him to date back to the period of 

 the great Mammals, in which case they will furnish fresh evidence 

 of the coexistence of man with extinct animals. — Comptcs Rcndus, 

 June 3, 1878, p. 1359. 



