100 EDENTATA. 



exceed one third the total length of the cranium, the lachrymal is 

 prominent, the interdental portion of the palate very narrow, and 

 the premaxilla probably aborted. The length of the portion of the 

 mandible in advance of the teeth scarcely exceeds that of the whole 

 dental series, and the superior border of the symphysis is but slightly 

 curved upwards. The astragalus is intermediate between that of 

 S. leptocephalum and S. bravardi, but nearest to the latter. There 

 is an entepicondylar foramen to the humerus. 



The cranium of this species comes very close to that of the smaller 

 S. bronyniarti, from Brazil, figured by Lund in the ' K. Danske Vid. 

 Selsk. Skr.' vol. ix. pi. xxviii., under the name of Platyonyx, but is 

 distinguished by the much greater breadth of the facial portion. 

 In its extremely short nasals this species comes nearest of all to 

 Mylodon. 



Hab. South America (Chili). 



M. 2819. The cranium, incomplete anteriorly and posteriorly ; from 

 (^7.) the Pleistocene of Tamarugal, in the province of Tarapaca, 

 a district formerly belonging to Peru, but now annexed to 

 Chili 1 . This specimen is described and figured by the 

 present writer in the ' Proc. Zool. Soc.' 1886, p. 496, 

 pi. xlviii., and, together with the associated remains, 

 forms the type of the species. The length of the superior 

 surface is 0,400, and that of the nasals 0,150. 



Presented by Don Modesto, Basadre, 1886. 



M. 2820. A less perfect cranium, wanting the nasals : from Tama- 

 rugal. Same history. 



M. 2818. Fragment of the middle portion of the cranium ; from 

 Tamarugal. Same history. 



M. 2821. The symphysis and portions of the rami of the mandible; 



(Fig.) from Tamarugal. This specimen is described and figured 

 by the present writer, op. ait. p. 496, pi. xlix. fig. 2. The 

 length of the symphysis is 0,124, and the interval between 

 the latter and the first tooth 0,012. Same history. 



The following bones were found in association with the preceding 

 specimens, and were presented at the same time. 



M. 2827. The imperfect right scapula. 



1 See Proc. Zool. Soc. 1886, pp. 395-6, where a map of the vicinitj is given. 



