R. 8. Lull — New Tertiary Artio dactyls. 85 



other material came from the opposite side of the small 

 canyon and from the same approximate levels. 



Procamelus sp. — Found among the Aletomeryx mate- 

 rial are portions of a right tarsus, including the astra- 

 galus, cuboid, and navicular, and the distal end of the 

 tibia, all of which articulate perfectly, as well as parts of 

 the cannon-bone and the phalanges. These pertain to a 

 camel of moderate size, and may provisionally be referred 

 to Procamelus sp. indet. 



Rhinoceros gen. et sp. indet. — There is also a portion 

 of a lower molar of a rhinoceros of indeterminate genus 

 and species. Further rhinocerine skull fragments came 

 from the overlying layers. 



Chelonia. — There are also the remains of two or three 

 turtles, including a very perfect skull which lacks only a 

 part of the dorsal surface. This Doctor Wieland has 

 identified as Trionyx, while the other material pertains 

 either to two different Emyds or an Emyd with one of 

 the Testudinidse. 



Protohippus placidus. — A conjectural association 

 which, were it not conjectural, would be of real value as 

 a time determinant is a horse molar belonging to Pro- 

 tohippus placidus or niobrarensis, which Professor 

 Buwalda considers as not earlier than Lower Pliocene 

 time. It is labelled as of Quarry F, but differs in color 

 from any of the teeth from the actual 6-foot level, and 

 we have no positive record of its having been found 

 in situ. It might have come from one of the overlying 

 beds. On the opposite side of the canyon, but at a some- 

 what higher level, Mr. F. W. Darby found a lower jaw 

 with teeth so badly worn as to be undecipherable, to- 

 gether with a metapodial and phalangeal bones. They 

 pertain to a horse about the size of that which bore the 

 tooth mentioned above, and may represent the same genus 

 and species, but more probably belong to a Merychippus. 

 If correctly identified, they would fix the age as not later 

 than early Pliocene or late Miocene. 1 



ALETOMERYX GRACILIS, N. GEN. N. SP. 



The small ruminant, evidently an antelope new to 

 science, may be called Aletomeryx 2 gracilis, n. gen. n. sp. 



Professor Merriam, after inspecting the material, agrees with this 

 opinion concerning its geological age. 



2 From aXriTTjs, wanderer, and firipv£, ruminant. The name is chosen 

 because of the great migratory power indicated by the slenderness of 

 limb, etc. 



