804 J Dolphin which never leaves Rivers. 



and feeds chiefly on partridges, — a new species of fox, much 

 dreaded by the natives of Patagonia, — and a beautiful specimen 

 of that species of bear named Ursus ornatus by M. F. Cuvier, 

 of which the museum contains only a single example, in a bad 

 state of preservation. 



In the family of seals, our collections are indebted to him for 

 a magnificent skeleton of the eared seal, and for the cranium of 

 a kind of seal (phogue a trornpe), upwards of twenty feet long, 

 forming no doubt a new species. 



The edentated land animals, and particularly the armadillos, 

 have been the subject of M. d'Orbigny's observations ; he has, 

 in fact, collected many species either new or wanting to our col- 

 lections, although described upwards of fifty years since by 

 D'Azara. By attending to their manners, he has ascertained 

 that many of them are of sufficiently carnivorous propensities to 

 disinter carcasses, while others feed exclusively on fruits. But 

 in all, the flesh is equally white and agreeable to the taste, as 

 he had often occasion to judge from experience. 



The family of edentated aquatic animals, or cetacete, has 

 likewise been augmented by many new species. Of these the 

 principal one belongs to the division Delphinorhynchi, and in- 

 habits rivers even more exclusively than that of the Ganges, 

 certainly never leaving them, since M. d'Orbigny found it 800 

 leagues from the sea, in the Mamore. It is, besides, remarka- 

 ble in retaining at all ages the short hairs or moustaches on the 

 muzzle.* 



But it is in the tribe of gnawers that M. d'Orbigny has made 

 the greatest number of discoveries, not only in species, but even 

 in genera and subgenera. Besides many squirrels from the Cor- 

 dilleras, we have remarked a new species of Ctenomys, — a very 

 interesting collection of Viscaches and of Chinchillas, with ske- 

 letons, — many species of rats or of campagnols, and a new spe- 

 cies of rabbit which does not burrow, — a species, likewise new, 

 of Agouti, with two fingers only on the hinder legs, — two or 

 three species of cobay, or Guinea-pig, which inhabit the most 

 elevated regions of Patagonia, — and, lastly, two other gnawers 



• This new species is figured and described by M. d'Orbigny under the 

 name of fnia Boliviensis, in the third volume of the Nouvelles Annates du 

 Museum d'Histoire Naturelle. 



