GIANT GROUND SLOTHS — GAZIN 347 



assemblage, the balance of the collection, is a rather insignificant quan- 

 tity of material contained in a single collection drawer and consisting 

 of isolated teeth, portions of jaws and other determinable bone frag- 

 ments. The El Hatillo fauna and the material representing it may be 

 listed as follows : 



Pseudctnys, sp. — turtle carapace fragments. 



Cairina moschata (Linnaeus) — niuscovy duck; distal end of ulna. 



Eremotherium rusconii (Schaub) — giant megatheriid ground sloth; the great 

 bulk of the collection, although a part of this material may represent a some- 

 what smaller species described by Hoffstetter as Eremotherium clenense, if 

 this can he regarded as distinct. 



Cf. Glossotherium tropicorum Hoffstetter — broad-snouted mylodont sloth; a 

 lower jaw portion with the greater part of three teeth. 



Scclidothcriumt, sp. — a long-snouted mylodont sloth; two cheek teeth. 



Hoplophorid?, possibly Lomaphorus, sp. — a glyplodont sloth ; a single hexagonal 

 scute. 



Olyptodon, sp. — a large edentate with a turtlelike carapace; two caudal vertebrae 

 and several scutes with typical rosette pattern. 



Neochocrus cf. robttstus (Leidy) — giant capybara ; a maxillary portion, frag- 

 ments of a cheek tooth, and a segment of an incisor. 



Cuvieronius, probably C. hyodon (Fischer) (=M. andium Cuvier) — the South 

 American mastodon ; several portions of one individual including two badly 

 worn last molars and sections of the tusks. 



Equus, sp. — horse, possibly belonging to subgenus Amerhippus; three isolated 

 upper cheek teeth, an incisor, and a toe bone. 



Tayassuid, gen. indet. — peccary ; canine tooth. 



Odocoileus, sp. — deer ; small horn. 



The El Hatillo assemblage corresponds rather closely to the Carolin- 

 ian upper Pleistocene fauna described by Hoffstetter from the Santa 

 Elena peninsula in Ecuador. The Santa Elena fauna is better known 

 in number and kinds of animals represented, as well as by the quality 

 of the remains encountered in all but the giant sloth. The representa- 

 tion of Eremotherium is in no way comparable to the magnificant 

 series of specimens obtained at El Hatillo. A similarity in the faunas 

 exists also in the absence of any representation of the peculiar ungulate 

 types, such as the toxodonts, which were so characteristic of earlier 

 stages of the Age of Mammals in South America. 



The dearth of forms encountered at La Coca, on the other hand, 

 with only Eremotherium and Toxodon represented, is very like that at 

 El Totumo in Venezuela where Schaub reported only Megatherium 

 (this is Eremotherium), Stegomastodon, and Toxodon. I strongly 

 suspect that the La Coca and El Totumo occurrences are a little earlier 

 than those at El Hatillo and Santa Elena, although the evidence is 

 not positive, and that Toxodon became extinct between the times 

 represented. 



The relatively greater age for the La Coca occurrence in comparison 

 with that at El Hatillo would seem further indicated by the physio- 



