NO. 2025. CAMELS OF THE FOSSIL GENUS CAMELOPS—HAY. 271 



to have supported the upper side of the canine indicates that this 

 tooth also was one of considerable size. The left maxilla shows that 

 the infraorbital foramen was above the front of the first molar. The 

 region in front of this is not so constricted as in the dromedary. 

 Between the fourth premolars the palate was 50 mm. wide; at the 

 front of the last molars, 87 mm. The palate was therefore narrower 

 than in Merriam's specimens. The left posterior palatme foramen is 

 situated somewhat behind that of the opposite side (Plate 26, fig. 1). 



The right ramus of the lower jaw permits various measurements 

 to be taken. The symphysis presents only about 22 mm. of its hinder 

 end. From the hinder end of this to the rear of the bone, above the 

 angle, is 385 mm. ; to the rear of the condyle, 415 mm. ; to the extrem- 

 ity of the coronoid process, about 450 mm. The depth of the jaw at 

 the rear of the symphysis is 48 mm. ; at the front of pm.4, 59 mm. ; at 

 the front of m.g, 83 mm.; at the rear of m.g, 110 mm. The measure- 

 ments indicate a jaw longer than that of Merriam's specunen 20028, 

 but with the depth about the same. 



It is not possible to determine accurately what was the length of the 

 symphysis m the type of C. huerfanensis. After makmg such esti- 

 mates as are possible with the materials at hand the length is taken 

 to have been at least 125 mm. On this assumption the length of the 

 jaw, to a point on the hinder border and on a level with the premolars, 

 will be about 505 mm.; to the rear of the condyle, about 530 mm.; 

 to the rear of the coronoid process, about 540 mm. 



The width of the coronoid process at the middle of its height is 46 

 mm. ; that from the front of this process to the rear of the condjde, is 

 92 mm. ; the former being therefore just one-half of the latter dimen- 

 sion. In the specimens of Camelus and Auchenia at hand the width 

 of the process is considerably less than half that of the jaw across the 

 condyle; and the same appears to be true in the case of Merriam's 

 specimens. 



Returning to the symphyses it may be well here to describe those 

 from Minidoka, Idaho. The largest one. No. 2579, is 120 mm. long 

 and was about 50 mm. wide at the narrowest place; 58 mm. wide 

 at the bases of the outer incisors. The mental foramen is placed 

 four-fifths of the distance from the front to the rear of the symphysis 

 and well behind the canine. In Merriam's specimens the foramen 

 is below or slightly behind the canine, and somewhat further forward 

 than in C. huerfanensis. In the other specimen from Minidoka (Plate 

 26, fig. 2), the symphysis has a length of 103 mm. and the foramen 

 is nearer the rear of the union. In these jaws, which probably 

 belonged to the same species as Cragin's specimen, the canines are 

 situated nearer the incisors- than they are in those found in California. 

 It may be noted here that in the type of C. huerfanensis the fourth 



