66 Loomis — Camels of the Harrison Beds. 



the most frequently found. Ir is characterized by i. 3/3 c. 1/1 

 pin. 4 4 in. :'> 3 brachyodont teeth, the upper incisors being 

 but little reduced, the third incisor being caniniform and 

 often of considerable size, occasionally larger than the canine. 

 The lirst premolar in both upper and lower jaw is double- 

 rooted. Limbs are long and metacarpals free, metatarsals also 

 separate except at the palmar process. The skull is usually 

 small and specific variations are perhaps best seen in the rela- 

 tive development of the snout as shown by the spacing either 

 side of the canine and lirst premolar. The relative size of the 

 canine and third incisor are also characteristic. 0. lonatpt & 

 is the largest of the known species and most fully described so 

 that it can conveniently be used as a standard for comparisons. 



Oxydactylus longipes Peterson 



Ann. Carnegie Museum, vol. ii, pp. 435-468. 1004. 

 This largest specie?- of the genus is also comparatively abund- 

 ant in the Upper Harrison beds ; and is characterized by a 

 moderately short snout, and by the third incisor being equal 

 to or slightly larger than the canine. 



Oxydactylus brachyodontus Peterson 

 Ann. Carnegie Musenni, vol. ii, pp. 469-471, 1904. 



This species is the most abundant of the Upper Harrison 

 camels, is slightly smaller than O. longipes. and has a much 

 more elongated and narrower snout, the third incisor being 

 smaller than the canine. 



Oxydacti/Jus lutti sp. now 



The type of this species is number 10327 of the Yale 

 Museum, found by Prof. R. S. Lull in the " breaks," about 

 five miles south of the Raw Hide Buttes, Converse Co., Wyo. 

 The type consists of a skull complete as to the jaws and 

 dentition, but lacking the major part of the brain case and 

 being considerably crushed laterally, and also of incomplete 

 limb and foot bones. Beside the type there are three other speci- 

 mens, all from the Upper Harrison beds, but none showing the 

 brain case. This species is nearest to 0. brachyodontus but is 

 smaller and of very different proportions. The facial portion 

 of the skull is as long as that of O. brachyodontus but much 

 lower throughout. The back part of the skull, especially in 

 the region of the premolar and molar series of teeth, is con- 

 siderably shorter than the foregoing. The third upper incisor 

 is much smaller than the canine, though caniniform in shape. 

 In the upper jaw the diastema between incisor 3 and the 

 canine is only 12""", which makes the canine seem very far 

 forward. Similarly in the lower jaw the first premolar is placed 



