BIG BADLANDS OF SOUTH DAKOTA. 79 



12518 Princeton. Lower zone of rusty nodules, Lower Ore- 

 odon beds, Indian Creek, Pennington Co., South Da- 

 kota. 



Lambe's type of H. priscidens. Titanotherium beds, Bone 

 Coulee, Cypress Hills, Assiniboia. 

 Hyracodon nebrascensis Leidy. 



10723 Princeton. Brown nodular layer above upper sand- 

 stones of Protoceras beds. Corral Draw, South Dakota. 



12662 Princeton. Fifteen feet below upper zone of rusty 

 nodules. Lower Oreodon beds. Corral Draw, South 

 Dakota. 



12666, 12687, 12688, 12680 Princeton. Upper zone of rusty 

 nodules, Lower Oreodon beds, Quinn Draw, South 

 Dakota. 



12563 Princeton. Lower zone of rusty nodules, east part of 

 Indian Creek basin, Pennington Co., South Dakota. 

 Hyracodon apcrtus sp. nov. 



10803 Princeton. Brown nodules above the Protoceras sand- 

 stone. Corral Draw, South Dakota. 



10978 Princeton. Upper Oreodon beds, Quinn Draw, South 

 Dakota. 



11414 Princeton. Upper Oreodon beds. South Dakota. 



12702 Princeton. Upper zone of rusty nodules. Lower Oreo- 

 don beds, Quinn Draw, South Dakota. 



12705 Princeton. Lower zone of rusty nodules. Lower Oreo- 

 don beds. Corral Draw, South Dakota. 

 Hyracodon leidyanus Troxell. 



10802 Princeton. Brown nodule layer above Protoceras sand- 

 stones. Corral Draw, South Dakota. 



Princeton University, 

 Princeton, N. J. 



