328 R. S. Lull — Pleistocene Ground Sloth, 



which gave abundant evidence of containing a mine of paleon- 

 tologic treasure. The excavation of this hill employed us for 

 several weeks and resulted in the finding of quantities of bone, 

 mostly fragmental, but giving a very important faunal sum- 

 mary of Lower Pleistocene time in that the remains were neces- 

 sarily those of contemporaneous forms. This fauna has been 

 discussed in detail by one of my associates in the work, Doctor 

 Edward L. Troxell, who made the data thus obtained the sub- 

 ject-matter of the dissertation for his doctorate at Yale. 



Among the other material were the remains of at least four, 

 and possibly five, individuals of the great ground sloth Mylodon. 

 These, taken collectively, may serve to amplify our knowledge 

 of the American Mylodonts, as they give a more complete 

 representation of the skeleton than any previous American dis- 

 covery, except perhaps the skeletons exhumed from the asphalt 

 deposits at Rancho La Brea, near Los Angeles, California. 



Locality. — The exact locality of the quarry is near the 

 head of Rock Creek in Briscoe County, Texas. Rock Creek 

 is a tributary of the Red River, which has carved for itself the 

 profound Palo Duro canyon to a depth of 1400 feet. The 

 valley of Rock Creek opens into Palo Duro canyon from the 

 south. 



Associated fauna. — The associated fauna, according to 

 Doctor Troxell,* includes the following forms : 



Class Mammalia 



Family Equidse 

 Equus calobatns Troxell 

 Equus sp. 



Family Camelidse 

 Auchenia hesterna Leidy 

 Eschatius conidens Cope 

 f E. macrocephalus (Cope) 



Family Canidse 

 Canis dints Allen 



C. texanus Troxell cf. mississippiensis Leidy 

 C. fsmvKS Leidy 

 C. temerarius Leidy 



Family Elephantidse 

 Elephas columbi Falconer or young imperator 



Family Suidse 

 Platygonus compressus Le Conte 



Class Reptilia 

 Family Testudinida3 

 Testudo campesler Hay 



* An abstract of Doctor Troxell's dissertation on the Rock Creek fauna, 

 containing the description of several new species, will appear in a later 

 number of this Journal. 



