274 0. C. Marsh — Description of Tertiary Artiodactyles. 



This simplicity of structure is characteristic of the Eocene 

 suillines, as already shown in the present article. In lower 

 Miocene forms, it is less distinct. The type specimen of the 

 present species and other remains were obtained by the writer, 

 in 1871, from the Pliocene deposits of eastern Oregon. 



Procamelus alius, sp. now 



In the same horizon in eastern Oregon in which is found the 

 peccary last described, remains of a very large extinct camel also 

 occur. Various portions of the skull and skeleton were secured 

 by the writer, and these all appear to pertain to the genus 

 Procamelus, as described by Leidy. These remains indicate 

 a camel exceeding in size any previously described from this 

 country, and one in which, the extremities were especially 

 elongated. In figures 33 and 31 below, the calcaneum of this 

 animal is represented one-fourth natural size. The known 

 remains of this species are from the Pliocene deposits, near the 

 John Day Piver, in Oregon. 



Figure 33. — Left calcaneum of Procamelus alius, Marsh; inner view. 

 Figure 34. — The same bone ; front view. Both figures are one-fourth natural 

 size, a, face for astragalus ; c, face for cuboid ; /, face for fibula. 



Correlation of Miocene Horizons. 



In the July number of this Journal, the writer made the 

 announcement that the horizon in the Miocene deposits of 

 Oregon, which he had explored many years since, and named 

 the Miohippus beds, was also represented east of the Pocky 

 Mountains, and in the same relative position, various vertebrate 

 fossils being common to both. In a previous number of the 

 Journal (November, 1893), the writer had stated that a distinct 

 horizon in the Miocene on the Atlantic coast, named by him 

 the Ammodon beds, corresponded to one in the Pocky moun- 

 tain region, in which the same genus, Ammodon, had been 

 found. More recent researches have brought out the interesting 

 fact that this horizon is essentially the same as the Miohippus 

 beds of the central region, and as those on trie Pacific coast as 

 well, so that at last a definite horizon is determined in the 

 Miocene, extending across the continent. 



Vale Universitv Museum, New Haven, Conn., August 15, 1894. 



