28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8l 



iius odontrigonus. It would cause no surprise, however, if further 

 material should indicate that the animals were generically distinct. 



The name comes alludes to the circumstance that the type specimen 

 was found so closely associated with fragments of pottery as to lend 

 strong support to the belief that the animal existed in Haiti as a 

 contemporary of man. 



PAROCNUS gen. nov. 



Plate 7; plate 8, tig. _' ; ])late 9; plate 10, tigs. J. 3 



Type. — Parociius scnts sp. nov. 



Characters. — Femur dififering from that of Acrafocints in the 

 absence of the lesser trochanter; in the conspicuous widening and 

 flattening of the upper half of the shaft ; and in the more nearly 

 vertical set of the head (as indicated by the line of the epiphyseal 

 suture in an immature individual), a condition which appears to 

 agree essentially with that present in N othr other ium as shown on plate 

 12 of Stock's Gravigrade Cenozoic Edentates of Western North 

 America. 



Remarks. — The genus Parocnus is readily distinguishable from 

 AcratocHHS 1)y the structure of the femur alone. If I have correctly 

 assembled the other parts which I believe to be associated with it 

 there are many important differential characters. These parts are as 

 follows: (a) a right humerus (pi. g), 200 mm. in greatest length, 

 resembling that of NothrotJierium shastense as figured by Stock 

 ( Cenozoic Gravigrade Edentates of Western North America, pi. 8. 

 fig. I, 1925) in general form but less heavily built, with relativel\ 

 broader proximal extremity and without the entepicondylar foramen 

 present in this sloth and in Acratocnus; (b) the proximal third of 

 a left tibia (pi. 8, fig. 2) and an entire left fibula probably of the 

 .same individual ; (c) a right astragalus (pi. 9, fig. 3) very different 

 from that of Hapalops as figured by Scott (Rep. Princeton Exped. 

 Patagonia, Pal., A'ol. 2, pi. t^t^, fig. 4) and Acratocnus as figured by 

 .\nthony ( MeuL Amer. INIus. Nat. Hist., n. s., \o\. 2, pi. 73. fig. 7, 

 1918) but resembling in a general way, particularly in its calcaneal 

 aspect, the very much larger calcaneum of Mcgalonyx figured by 

 Stock (p. 87, fig. 31, A, B, C, D) ; (d) three calcanea (2 left, 

 I right) of a form (pi. 9, fig. 2) conspicuously different from that 

 seen in Hapalops and Acratocnus but essentially similar in plantar 

 and astragalar views to the calcaneum of Mylodon as figured by Stock 



