No. 2391. DESCRIPTIONS OF PLEISTOCENE VERTEBRATA—HAY. 607 



The first phalange (pi. 123, fig. 1) is compared with that of the 

 dromedary. 



Measurements of first anterior phalange in millimeters. 



Length of bone in median plane 



Fore-and-aft diameter of proximal articular surface 

 Side-to-side diameter of proximal articular surface. 



Fore-and-aft diameter at middle of length 



Side-to-side diameter at middle of length 



Width of articular surface at distal end 





This phalange resembles much that of the dromedary and differs 

 from that of Camelops in the greater antero-posterior flattening of 

 the bone and in the extension of the articular surface for the second 

 phalange backward on the lower face of the bone. In this respect 

 it agrees with the phalange here made the type of Camelus arcto- 

 americanus. In each of these bones the articular surface extends 

 backward about 43 mm. The two bones hardly belonged to the 

 same species. As will be seen on comparing the measurements they 

 are of nearly the same length, but differ in other dimensions. 



The second phalange is broad and flattened. The greatest length 

 in the median plane is 81 mm.; the greatest width near the upper 

 end, 51 mm.; the greatest width in the lower half, 49 mm. 



It seems to the writer that the remains of the large camel from 

 Christmas Lake and those from Washtucna Lake indicate a species 

 different from any described species of Camelops and that this ani- 

 mal belonged to the genus Camelus. Following Doctor Matthew's 

 suggestion it is named Camelus maximus. The first phalange from 

 Washtucna Lake is made the special type specimen. 



Type specimen. — A first phalange, No. 9717, U.S.N.M. 



Type locality. — Washtucna Lake, Washington. 



Type formation. — Early Pleistocene. 



Diagnosis. — Size large. Width of upper end of phalange equaling 

 one-half of the length of the bone. Lower articular surface carried 

 back on lower surface of this bone as in Camelus. 



CAMELUS ARCTOAMERICANUS, new species. 



Plate 119, fig. 12. 



Type specimen. — A first phalange, No. 7713, U.S.N.M. 



Type locality. — Old Crow River, near Alaska- Yukon boundary. 



Type formation. — Pleistocene. 



Diagnosis. — A large camel with broad phalanges, whose upper 

 articular surface from side to side equals less than one-half of the 

 length of the bone, and whose lower articular surface extends well 

 backward on lower face. 



