638 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



and it appears therefore that Procamelus is definitely brought up 

 into the Pleistocene. It is too early to say that the same thing will 

 happen for the rhinoceroses, but it may be expected. The ex- 

 planation given by the author in the article cited above is that the 

 mentioned deposits in Florida, Idaho, and Oregon belong to the 

 time of the first glacial, or Nebraskan, stage of the Pleistocene. 

 The collection made at Anita, Arizona, appears to give testimony 

 for this view. 



6. ON SOME ADDITIONAL FOOT BONES OF TEINOBADISTES SEGNIS 



FROM FLORIDA. 



Plate 119, figs. 6-11. 



In 19 19, 21 the writer described a new genus and species of ground 

 sloth (TMnobadistes segnis). This species was based on a left astra- 

 galus which had been found in "Mixon's bone bed," near Williston, 

 Levy County, Florida, in 18S7. Since that description was written, 

 seven other foot bones which had been found at the same time and 

 place, have come to light in the United States National Museum. In 

 all probability these belonged to the same individual as the astragalus. 



The rediscovered bones are the navicular, the third, the fourth, 

 and the fifth metatarsals of the right hinder foot, the second phalange 

 of the right hinder foot, the proximal end of the ungual phalange of 

 the same digit, and the right second metacarpal. 



The right second metacarpal (Cat. No. 2509a; pi. 119, p. 6) has about 

 the size of that of Mylodon robustus 22 The total length of the bone 

 is 78 mm.; the height at the distal trochlear ridge, 46 mm. Owen's 

 description of this bone in Mylodon 23 applies well to the one in hand. 

 The navicular (Cat. No. 2509&; pi. 119, fig. 7) conforms to the descrip- 

 tion given in Owen's article cited. Its side-to-side dimension is 68 

 mm.; its width, somewhat more than 41 mm., being thus somewhat 

 smaller than that of Mylodon robustus 2i Compared with the same 

 bone of Mylodon sodalis, it is considerably smaller, thinner, narrower, 

 and has the surface for articulation with the cuboid at right angles 

 with the surface for the astragalus, while in M. sodalis it is oblique 

 to that surface. The third metatarsal (Cat. No. 2509c; pi. 1 19, fig. 8) 

 is much like that of Mylodon robustus, but it appears to be somewhat 

 larger. Its greatest axial length is 70 mm. It differs from the cor- 

 responding bone of Mylodon robustus in having a facet on the inner 

 side of the proximal end for the second metatarsal. It is near the 

 lower border of the bone and looks downward. This facet is about 

 18 mm. long and 11 mm. wide. Below it the surface of the bone is 

 rough, as though the base of the second metatarsal had been closely 

 bound to the third. 



'i Proc. U. S. Nat. Mus., vol. 56, p. 104, pi. 27. « Idem, p. 91. 



« Owen, Monogr. Mylodon, pis. 15, 16. ,4 Idem, p. 175. 



