Peterson: Miocene Beds of Nebraska and Wyoming. 35 



Wyoming. The fine-grained and incoherent sandstones in this hori- 

 zon do not differ much from the immediately underlying Monroe 

 Creek beds. Flattened and horizontally columnar masses of concre- 

 tions are perhaps more frequently encountered and are of greater 

 extent in these beds than in the underlying formations. The fossils 

 discovered also represent a fauna differing somewhat from that in the 

 Monroe Creek beds. 



List of the Fauna. 



vis. 



Parahippi 



Promerycochcerus vantasselensis, sp. nov. 

 Merychyus harrisoncnsis ', sp. nov. 

 Meryc/iyus? sp. indet. 

 Syndyoceras cooki, Earbour. 

 Stenomylus gracilis, gen. et sp. nov. 

 Brachypsalis simplicidens ; sp. nov. 

 Thinohyus sioitxensis, Peterson. 

 Steneofiber fossor, Peterson. 

 Steneofiber barbouri Peterson. 



Description of New Material. 



Parahippus? sp. indet. 



A number of individuals represented by feet and limb bones are in 

 the collection from the Harrison beds. Unfortunately there are no 

 teeth with any of the specimens and comparison must be conjectural. 



No. 1474 9 (Cam. Mus. Cat. Vert. Foss. ) represents good fore feet 

 and limb bones of a larger individual than Parahippus (Des?uatippiis) 

 crenidens Scott, but all the comparative measurements very nearly 

 agree, and the material is provisionally regarded as belonging to this 



genus. 



Specimen No. 1445 consists of the proximal end of the humerus, 

 radius, and ulna, a complete median metacarpal and three phalanges. 

 The remains are of an animal the legs of which are shorter and heavier 

 than those of the species described by Scott. 



9 This specimen was presented to the writer by Harold J. Cook. 



