70 DR. A. SMITH WOODWARD ON REXIAIXS OF [Jan. 23. 



only by the head, but also by a diminutive lower facette, which is 

 in contact with a small facetted process (x) on the anterior arm of 

 the incus. A feeble indication of the same secondary articulation 

 is also observable in Cholcepus; but it is curiously absent in the 

 second specimen of Grypotherium. The two divergent arms of the 

 incus (i.) are equal in length, as usual in the Sloths. The stapes 

 (s.) is onlv very slightly perforated in both specimens ; while a 

 small circular disc firmly fixed to the incus represents the 

 orbicular bone in the second skull. The auditory ossicles 

 of Grypotherium, therefore, are very different from those of 

 Myrmecophaga, in which the malleus is less sharply bent, the incus 

 has divergent arms of unequal length, and the stapes exhibits a 

 large perforation K 



Vertebra and Li tub-bones. 



Nearly all the remains of vertebrae and limb-boues are in the 

 same state of preservation as the portions of skull and mandible 

 already described, with adherent cartilage and traces of muscles 

 and ligaments. With some of the ungual phalanges there are also 

 well-preserved examples of the epidermal sheath. The best of the 

 latter, probably belonging to the fourth digit of the manus, is shown 

 of two-thirds the natural size in the drawing (PL IX. figs. 1, la). 

 As already remarked by Roth, its edges are quite sharp, and 

 indicate that if the animal walked on its fore feet it resembled 

 Myrmecophaga in the peculiar twist of the manus. 



xill the specimens in this series seem to have been accurately 

 determined and sufficiently described by Roth. It is only 

 necessary to emphasize the fact that the two shafts of humerus 

 with abraded, not sharply-broken, ends have a much more fossilized 

 appearance than any other specimen in the collection, and are 

 deeply stained throughout by ferruginous matter. The small shaft, 

 no. 22, certainly seems to have belonged to an adult animal, as 

 remarked by Roth, and it was probably much smaller than 

 any individual indicated by the other remains. 



Skin and Hair. 



The new piece of skin, which is stated by Hauthal to have been 

 found in the deposit of excrement, is not quite so well preserved as 

 the original piece. It is much folded in an irregular manner; and the 

 hair, which is yellower than in the previous specimen, is preserved 

 only in patches on the outer face. It must have been stripped 

 from the body of the animal by man ; but the only distinct marks 

 of tools, which were evidently made when the skin was fresh, are 

 a few indents and small pits on the outer face. The indents must 

 have been made by oblique thrusts of a stick, or a small, blunt, 

 chisel-shaped instrument, and are well shown in Roth's photograph 

 (loc. cit.) on the portion marked d, e. The small pittings are 



1 J. Hyrtl, ' Vergleichendanatoiuische Untersucliungen liber das innere 

 Gehororgan des Menschen und der Saugetbiere ' (1845), p. 135, pi. v. fig. 6. 



