50 



PROCEEDINGS OF THE ACADEMY OF 



[1885. 



grown animal of Mylodon Harlani, preserved in our museum. 

 In this, among some rude casts in plaster, the originals of which 



were described by Dr. 

 Harlan, under the name 

 of Orycterotherium mis- 

 souriense (Am. Jour. Sci., 

 1843, G9), and subse- 

 quently 7 referred to Mylo- 

 don Harlani, is one of 

 a lower-jaw fragment, 

 which contains the first 

 molar, and the mutilated 

 base of the second. The 

 latter, in the perfect state, 

 would appear to accord 

 in shape and size with 

 the corresponding tooth 

 l. in the Kentucky jaw- 



fragment, referred to 3Iylodon Harlani. The first molar is 

 unlike that of Mylodon robustus, but sufficiently accords in size, 



shape, and condi- 

 tion of wear, with 

 the Louisiana tooth 

 to regard this as 

 pertaining to the 

 same animal. The 

 remaining Louisi- 

 ana specimen is 

 not only unlike 

 any of the teeth of 

 Mylodon ?'obustus, 

 but differs from 

 them to such a 

 degree as to render it doubtful whether it belongs to the same 

 genus. In comparison with other teeth of the lower or upper 



series, in size and 

 shape, it accords 

 with the canine 

 molars of Megalonyx 

 more than it does 

 with any of the teeth 

 of Mylodon. The 

 triturating extrem- 

 ity and transverse 

 section are repre- 

 sented in the outlines 

 3 and 4. It is more 

 uniformly elliptical in transverse section than in the canine 

 molars of Megalonyx, and is devoid of the abrupt median bulge 



