1898.] Wortman, Extinct Canielida. of North America. I 27 



Blanco Beds of Texas. One of these species, P. vulcaiioruin, was 

 founded upon a superior maxillary bone with most of the teeth in 

 place, but as the diagnosis of the genus rests exclusively upon the 

 number of premolars in the lower jaw, I do not see how this 

 species can be admitted until the lower dentition is determined. 

 It is therefore discarded. 



Pliauchenia humphresiana Cope. 



The ty]:<e of this species consists of the anterior portion of two 

 lower jaws from the Loup Fork of New Mexico. A second 

 specimen which I refer to this species is from the Loup Fork Beds 

 of Long Island, Phillips County, Kansas, collected by the Museum 

 party during their explorations there. The specimen consists of 

 the greater part of a lower jaw broken just in advance of the first 

 premolar and bearing all the molars and premolars with the 

 exception of the first and third. In size the specimen about 

 equals the smaller individuals of Procamelus occidentalis, which it 

 otherwise closely resembles in the structure of the teeth. The 

 molars are of the narrow and elongated type, and the premolars 

 have the same structure as that seen in the various species of 

 Procamelus. 



Pliauchenia minima, sp. nov. 



The smallest species of Cameloid yet known from the Loup 

 Fork deposits is represented in the collection by the greater part 

 of a lower jaw, from Decatur County, Kansas, which I provision- 

 ally refer to the above genus. The specimen is broken posterior 

 to the symphysis and does not display the incisors, canine nor 

 first premolar, if indeed this latter tooth were present. The 

 diastema in front of the third premolar is unusually long and the 

 ramus in this region remarkably slender; more so, in fact, than in 

 any known species of the Camelidaj. The third and fourth 

 premolars are present but considerably reduced in size. The 

 molars are of the usual pattern. Some fragmentary remains of a 

 hind foot from this same region are probably to be referred to 

 this species. The phalanges and distal ends of the metapodials 

 are extremely cameloid, but unusually slender and delicate. 'I'he 



