V. DESCRIPTION OF A NEW SPECIES OF PROCAMELUS 



FROM THE UPPER MIOCENE OF MONTANA WITH 



NOTES UPON PROCAMELUS MADISONIUS 



DOUGLASS. 



By Earl Douglass. 



Procamelus elrodi sp. nov. 



(Type No. 777, Carnegie Museum Catalogue of Vertebrate Fossils.) 



(Plates IX to XI.) 



The type of this species is a nearly complete skull and mandible with 

 the greater portion of the neck. It was found by the writer in a 

 pinkish, fine-grained stratum beneath river deposits of conglomerate 

 and sand, which are exposed in the bluffs on the east side of the lower 

 Madison Valley in Montana nearly east of Hyde Post-office. 



The species is distinguished by its large size, the pit into which the 

 infraorbital foramen opens and the much larger pit above it, the heavy 

 but not deep mandible, the prominence of the postero-superior por- 

 tion of the angle and the relative proportions of the cervicals which 

 decrease in the length of the centra from the axis backwards. 



Deflation. — All the teeth are more or less worn, indicating that 

 the animal was fully mature. The teeth anterior to the molars are 

 preserved, but are all somewhat worn, especially the last three pre- 

 molars. The molars on the left side are gone and the first two on the 

 right side are nearly destroyed. 



Upper Teeth. — About 7 mm. anterior to the third incisor on the 

 right side there is a small rudiment of a second incisor in an alveolus 

 2 mm. in diameter. The tooth does not appear to possess any enamel 

 and does not project below the alveolar border. 



I^ is a heavy caniniform tooth, nearly circular in section. The 

 canine is a little narrower transversely and a little longer antero-pos- 

 teriorly than I^ and is elliptical in section. It curves slightly for- 

 ward like the canines of many of the carnivora. Pi is smaller than 

 the canine but has nearly the same form. P-^ is narrow transversely, 

 but is attached by two heavy roots. P^ is larger and has three roots. 



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