734 



THE AMERICAN NATURALIST 



[Vol. XLI 



labeled with reference to their position in the quarry, in order 

 to trace the different skeletal remains which may continue from 

 one block to another. In working out this material, we find that 

 there are parts of skeletons which are articulated and associated. 



As there has been doubt among palaeontologists regarding 

 Professor Marsh's genus Moropus, I decided to present the figures 

 of some casts (Figs. 1-11). These were made, by permission of 

 Professor Schuchert, from the types which were described as bones 

 of edentates by IVIarsh. By permission of the Authorities of 

 Yale Museum, these t}pes are here illustrated for the first time^ 

 and they quite correctly represent the specimens. With the types 

 are associated such specimens of Moropus from the Agate Spring 

 Quarry (Figs. 12-20) as will at once show the characters which 

 are identical. 



All figures i natural size 

 Type of Moropus distans Marsh. From the John Day Formation, Oregon. 



Fig. 1.— Dorsal view of first and portion of second co-ossified phalanges. 



Fig. 2.— Proximal articular view of the cuboid. 



Fig. 3.— Dorsal view of a second phalanx. 



Fig. 4.— Plantar view of tlie satrie phalanx. 

 Type of Moropus senex Marsli. From the Jolui Day Formation, Oregon. 



Fkj. r>. —Dorsal view of the first and portion of second co-ossified phalanges. 

 Type of V >rnpu^- clatu^ Marsh. From the Miocene of Nebraska. 



