APPENDIX A 325 



I am therefore of opinion that Grypotherium is the correct generic 

 name for the Ground-Sloth from the Patagonian cavern, while Glosso- 

 therium must be relegated to the synonymy of Mylodon. 



The specific determination of the new specimens is more difficult. As 

 remarked by Roth, only two species of Grypotherium seem to be already 

 known from the Pampa formation — G. darwini by three skulls* and 

 G. bonaerense solely by a maxilla.f The portions of skull and dentition 

 now under discussion indicate an animal much larger than G. bonaerense 

 (assuming the original maxilla to be that of an adult) ; while they are con- 

 siderably smaller than any known specimen of G. darwini. Moreover, the 

 nasal arcade now described is narrower and more concave on its outer face 

 than that of G. darwini, as already observed by Roth. It thus seems 

 very probable that the animal from the Patagonian cavern represents 

 a distinct species, which must bear the name of G. listai. This specific 

 name was given by Ameghino to a fragment of the first-discovered piece of 

 skin, and the curious argument which leads Roth to propose the substitu- 

 tion of a new name for it does not affect its validity. 



It maybe added that Dr. Erland Nordenskjold has recently compared 

 his specimens from the Patagonian cavern with the skull of Grypotherium 

 darwini at Copenhagen, and finds no specific difference. J No particulars 

 however, have yet been published. 



2. Associated Mammalian Remains. 



Felis, sp. 



A feline carnivore larger than the existing Jaguar {Felis oncd), but 

 about the same size as an average Tiger {F. tigris), is represented in 

 the collection by the distal half of a right humerus (No. 44), a left fourth 

 metatarsal (No. 46), and the distal end of another metatarsal (No. 47). 

 These bones have evidently been buried in dust, but are in the same fresh 

 state of preservation as those of Grypotherium. 



Careful comparison of these bones shows that they are undoubtedly 

 feline ; and there is no difficulty in determining that they belong to Felis 

 rather than to the extinct MacJicerodus. A humerus of M. neogczus, from a 

 Brazilian cavern, now in the British Museum (No. 18972 i5), is readily 



* Described respectively by Reinhardt, Burmeister, and Lydekker, loc. cit. 



\ F. Ameghino, " Contribuoion al Conocimiento de los Mamiferos de la Republica 

 Argentina " (1889), p. 738, pi. xliv. Fig. 8. 



I E. Nordenskjold, "La Grotte du Glossotherhim {Neomylodon) en Patagonie," 

 Comptes Rendus, vol. cxxix. (iSgg), p. 1317. 



