1898.] W'ortman^ Extinct Camelidcz of North America. 99 



differs from the European Deilotherium^ Spa?uot/ieriii/>i, Metrio- 

 t/ierii/m, Moiiillacitherium and Oxacron of Filhol, which are 

 placed by Zittel in the subfamily Dichobuninte. On account of 

 the very imperfect knowledge we have of these forms, no com- 

 parisons are at present possible. 



In specimen No. 2071, the upper and posterior portion of the 

 cranium is sufficiently preserved to indicate a relatively high over- 

 hanging occipital and a strong sagittal crest, the latter dividing 

 into two well-marked lateral postorbital branches. In advance of 

 the point of division of these two branches a strong ridge is 

 continued forward upon the frontals in the median line as in 

 many of the lower forms of the Selenodonts. The postorbital 

 process is well developed, but it does not join the molar, so that 

 the orbit is not enclosed by bone posteriorly. There is no evi- 

 dence of the presence of any long horn-cores. 



Of the fore limb, the distal ends of the ulna and radius are pre- 

 served, but they are considerably crushed. There is apparently 

 little or no tendency to coossification of the bones, although the 

 shafts are closely applied to each other in the lower third of 

 their extent. The articular end of the radius shows distinct 

 facets for scaphoid and lunar, but does not touch the cuneiform. 

 The distal end of the ulna articulates solely with the cuneiform. 



The carpus is of the typical artiodactyl pattern, and especially 

 resembles that of the earlier Selenodonts. In the proximal row 

 the cuneiform rests exclusively upon the unciform, the lunar 

 about equally upon magnum and unciform, while the scaphoid is 

 supported below by magnum, trapezoid and trapezium. In the 

 distal row the unciform articulates distally with Mt. Ill, and to a 

 slight extent with Mt. II. In the modern Suillines, the Cameloids 

 and the later Oreodonts, the second metacarpal has lost all con- 

 nection with the magnum, but in the early Oreodonts Mt. II still 

 retains a contact between these two bones. In Protoceras of the 

 Oligocene a very minute contact is observable. 



The trapezoid is free, and shows no tendency to unite with the 

 magnum as in Leptomeryx., the later Tragulines and Pecora. The 

 trapezium is not preserved in the specimen, but judging from the 

 well-marked facets upon the scaphoid, trapezoid and Mt. II, it is 

 quite certain that it was not only present and of good size, but 



