ipiS-] 



LOWER PLIOCENE SNAKE CREEK BEDS. 



77 



Hipparion gratum {A, P). 



Hipparion cf. ajfine {A, P). 



Protohippus cf. /^/aac^M^ (F, probably 

 A). 



Protohippus near pcrdifus {P, prob- 

 ably ^). 



Pliohippus cf. mirabilis (P). 



Pliohippus sp. div. {A). 



Peccaries. 



Prosthennops cf. crassigenis (A). 

 Prosthennops sp. {A, P). 



Oreodonts. 



Mervchyus (Metoreodon) relictus 



(A). 

 Merychyus {Metoreodon) profectiis 



(A,P). 

 Merychyus (Metoreodon) sp. (A, P). 

 Pronomotherium siouense sp. nov. 



iP). 



Camels. 



Protolabis princetonianus sp. nov. 



(P). 

 Pliauchenia (Megatylopus) gigas 



{A, P). 

 Alticamelus procerus {A, P). 

 Alticamelus sp. div. {A, P). 

 fProcamelus sp. div. {A). 



Antelopes and Deer. 

 Dromonieryx whitfordi sp. nov. (P, 



A).^ 

 Drepanomeryx falciformis gen. et 



sp. nov. (P). 

 Cervus sp. {A, P). 

 Blastomeryx elegans (A). 

 Blastomeryx cf. wellsi {A). 

 Merycodus necatus sabulonis (A, P). 

 Merycodus cf. necatus (A, P). 

 Merycodus sp. div. (A, P). 



BOVIDS. 



Neotragocerus improvisus {A, P). 

 Bovid gen. indet. {A). 

 Bison sp. {A). 



Mastodons. 

 Gomphotherium sp. {P). 

 fMastodoH sp. (P). 



Birds. 

 Aquila dananaf {P).^ 

 Buteo near borealis (P).* 



Reptiles. 

 Crocodile vertebra (P). 

 Lizard jaws (P). 

 Huge land tortoise (A, P). 



Of Uncertain Position. 

 Part of large mammal jaw (P). 



The collections obtained by the Princeton expedition have greatly 

 increased the number of Miocene genera represented in the Snake 

 Creek fauna. ArchcEohippus excepted, Brachypsalis, Pseudcslurns, 

 Pronomotherium, Protolabis and Dromomeryx have species in the 

 Upper Miocene, distinct, but not strikingly different from, their 

 Snake Creek successors, rather increasing the close relationship of 

 the fauna with that of the Upper Miocene previously commented 

 on by Matthew and Cook. Additional Pliocene elements are far 



3 Palccomeryx sp. of Matthew and Cook. 



4 Represented in the Princeton collection by a fragment of the tarso- 

 metatarsus. Determinations by Dr. Loye Holmes Miller. 



