Cope.] 4:bo [Nov. 15, 



On Some Plistocene Mammalia from Petite Anse, La. 



By E. D. Cope. 



{Read btfore the American Philosophical Society, November 15, 1895.) 



The remains of extinct Mammalia from Petite Anse, Louisiana, have 

 been the subj ect of two brief communications to the Academy of Natural 

 Sciences by Prof. Leidy, 1884, p. 32, and of a longer one in the Irans- 

 actions of the Wagner Free Institute of Science, 1889, p. 33. Mr. H. C. 

 Mercer has published an account of remains of human industry found 

 at the same locality in the Ame7'ican Naturalist for 1895, p. 393. His re- 

 marks are based partly on a letter from Dr. Joseph M. Joor, M.D., of 

 New Orleans, who made an exploration of the locality in 1890, and fur- 

 nished a very full report to Mr. Mercer. The specimens were placed in 

 the Museum of the Tulane University, of New Orleans. Through the 

 kindness of President Johnson, of the University, the specimens were 

 submitted to me, and I give in the following pages the result of my ex- 

 amination. Dr. Joor reports the occurrence of an Equus and Mylodon 

 harlanii (already mentioned by Leidy), and probably some other giant 

 sloths, a small Mastodon and possibly an Elephas. I can confirm these 

 determinations of Dr. Joor, except as to the Elephas, which I have not 

 seen, and about which the doctor was in doubt. 



Mylodon haulanii Ovven. 



Of this species the collection contains the following teeth: A complete 

 series of superior molars, all separate, the anterior internal lobe of the 

 lliird, broken off; the second, fourth and fifth of the superior series of the 

 opposite side, all separate; the first, third and fourth of the inferior series, 

 all separate ; separate first and third inferior molars. 



The positions of the superior molar teeth have been deter.niined by com- 

 parison with the corresponding teeth in place of the Mylodon renidens 

 Cope, described below; and wiili the figures of those of the M. robustiis 

 Owen, given by Owen,* Ameghinof and Lydekker.J Leidy has already 

 described and figured the inferior molars. § In his description Leidy 

 remarks that the superior molars are unknown. I am now able to fill this 

 gap in our knowledge, and to point out some conspicuous characters in 

 which this species differs from the M. robustus of Owen. Leidj^ has 

 described the second superior molar from isolated specimens from Petite 

 Anse, La., and from Missouri, the latter from the type specimens of 

 Harlan's Orycterotherium mi8surien8e.,\\ supposing them to be first upper 



* Memoir on Mylodon robustus Owen, 18-12. 



t Mamm. Foss. Kepub. Argent., 1889. 



X Aiinales del Maseo de la Plata; Paleontologia Argentina, Hi, 1891. 



g Memoir on the E.ctinct Sloth Tribe of N. America, Smithson. Contrib. to Knowledge, ISo!. 



II Proceeds. Academy Phila., 1885, p. 19, Fijjs. 3-6. 



