330 P. S. Lull — Pleistocene Ground Sloth, 



Specific Summary. 



The North American Mylodonts have been referred to two 

 genera and six species, of which the list follows : 



MylodoH Owen 



Mylodon harlani Owen. Referred by Harlan to Megalonyx 



laqueatus. Type locality, Big Bone Lick, Kentucky. 

 M. sod alis Cope. Pliocene of Oregon. 

 M. renidens Cope. Petite Anse, Louisiana. 

 M. sulcidens Cope. Petite Anse, Louisiana. 

 M. garmani Allen. Near Hay Springs, Nebraska. 



Paramylodon Brown 

 P. nebrascensis Brown. Near Hay Springs, Nebraska. 



In addition to these a species of Mylodon has been described 

 from Colorado by Professor Cockerel], and a paper upon the 

 Mylodonts of the Pancho La Brea of California has been pub- 

 lished by Mr. Chester Stock. To the form mentioned in the 

 former publication no name has as yet been assigned, although 

 the Cockerell skull has been referred to M. harlani by Doctor 

 Allen. The Pancho La Brea skulls, however, which Stock 

 also refers to M. harlani, exhibit characters which serve to 

 link np the two genera Mylodon and Paramylodon, to the 

 confusion of the latter. 



Much additional material from widely remote localities has 

 been referred to M. harlani by various authors, but with a 

 considerable element of doubt, as the portions represented are 

 rarely anatomically comparable with the type. 



Mylodon harlani Owen. 



Originally described by Harlanf and attributed to Megalonyx 

 laqueatus ; recognized by Owenf as pertaining to a new genus, 

 Mylodon, and dedicated to the original discoverer. Owen's 

 description follows : 



" Subsequently to the discovery of these bones, and of those 

 of the Megalonyx laqueatus above alluded to, the remains of 

 another great Edentate animal were found in North America, 

 and were deposited in the Lyceum at New York ; among these 

 is a portion of the lower jaw with the whole dental series of 

 one side. It is thus described by Dr. Harlan : 



" ' The fragment I am now about to describe is a portion of 

 the dexter lower jaw of the Megalonyx, containing four molar 

 teeth ; three of the crowns of these teeth are perfect, that of 



* Harlan, R., Monthly Amer. Jour. Geol. and Nat. Sci.. vol. i, p. 74, 

 pi. 3, figs. 1-8, 1831. 



fOwen, R., Zoology, Voyage H. M. S. Beagle, Pt. I, p. 67, 1840. 



