630 Bulletin American Museu?n of Natural History. [Vol, XIX, 



apparently show. The main divisions of either section are 

 traceable around the head of the cafion and are continuous 

 with corresponding strata of similar character on the opposite 

 side. 



From the foregoing facts it seems evident that Cummins's 

 separation of the Goodnight beds on stratigraphic grounds is 

 scarcely admissible. 



Cummins's palseontologic grounds for the separation of these 

 beds is based on Cope's determination of the small collection 

 of fragmentary fossils taken from the vicinity of Mulberry 

 Canon on the south side. 



Cope's determination of these fossils is as follows ^ : 



Aphelops sp., Hippidium inter polatum Cope, 

 Protohippus lenticidaris Cope, " ? spectans Cope, 



ProLohippus sp., Equus eurystylus Cope, 



" ? perditis Leidy, " f simplicidens Cope. 



In referring to this list Cope ^ stated that two of these genera 

 are characteristic of the Loup Fork beds, but are not known 

 to extend higher; that Equus, on the contrary, had never been 

 found in the Loup Fork formation ; and that Hippidium was of 

 uncertain horizon. Of the species Cope said "the three which 

 are identifiable are new to science." 



As shown by the writer in a former paper 3 E. simplicidens 

 Cope and E. eurystylus Cope can not be referred to the genus 

 Equus, but on the contrary are distinctly Miocene in character 

 and only referable to Miocene genera. Hippidium is probably 

 an exclusively South American genus, and the species referred 

 to it by Cope are probably referable to the genus Protohippus. 

 The three species from the Mulberry Canon locality which Cope 

 considered identifiable are as follows: Protohippus lenticu- 

 laris Cope, Hippidium interpolatum Cope, and Equus eury- 

 stylus Cope. 



The first of these species is, perhaps, authentic, but it is 

 referable to the genus Neohipparion 4 and not to Protohippus. 



' Geol. Surv. Texas, 4th Ann. Rep., 1892 (1893), p. 45. 



^ Geol. Surv. Texas, 4th Ann. Rep., 1S99 (1S92), p. 45. 



= Bull. Am. Mus. Nat. Hist., Vol XIV, 1901, pp. 123-126. 



*■ The genus^ Hipparion was founded on an European type, though many American 

 species have since been referred to it. The writer, however, has separated generically 

 the American group from the Old World Hipparion, giving to the American group the 

 name Neohipparion. (Bull. Am. Mus. Nat. Hist., Vol. XIX, p. 467) 



