122 Bulletin American Museum of Natural History. [Vol. X, 



cameloides in size. The only valid distinction between P . trans- 

 montanus and G. cameloides is seen in the marked reduction of the 

 second superior premolar in the former, and as this is in the 

 direct line of modification leading to the Loup Fork Procamehis, 

 I have thought best to regard it as of generic rank, especially 

 until the question of the coossitication of the metapodials is defi- 

 nitely settled. 



Protolabis transmontanus Cope. 



This species was somewhat smaller than the modern Llama, 

 and so far as one can judge from the imjjerfect remains, e.^hibits 

 very similar proportions in its general form. The crowns of the 

 molars are notably shorter and have a more quadrate outline than 

 those of either the modern genus cr Procamcliis. This, however, 

 may be due in a measure to wear. The superior canine is smaller 

 than the third incisor ; the first premolar is two-rooted, and the 

 second is much reduced in size, as in Procanuius. The first and 

 second incisors are of goodly size, implanted by strong roots and 

 with obliquely-directed, more or less spatula-shaped crowns. 

 The nasals are relatively longer than in tiie Llama, and the 

 muzzle is moderately compressed laterally. 



Procamelus Lci<iy. 



Yn the widespread Loup Fork deposits of the plains region 

 remains of Camels are very numerous ; next to the Horses, they 

 are perhaps the most abundant fossils to be found in these beds. 

 A number of genera and species of these Camels have been 

 described, but, as has loo frequently hap])ened in the history of 

 the science in this country, unfortunately, misplaced zeal in the 

 finding and describing of new forms has been allowed to run riot, 

 and much of this work is a])])arently characterized by an utter 

 lack of the most ordinary display of judgment and discrimina- 

 tion. No less than four or five genera have been proposed, of 

 which not more than two are entitled to recognition. Of these 

 Procamelus is the more abundant, and is represented by three 

 well-marked and easily-distinguished species. The most distinc- 

 tive features of the genus are the possession of a full complement 



