P^rrKRSON : Nr.w Camei. krom thk Miocene of Nebraska. 201 



in extremely long anterior palatine foramina (sec PI. XXXVII). 

 The diastemata of the alveolar border on the premaxillary and maxil- 

 lar\' are ciuite large and it is evident that the antero-posterior diameter 

 ot the nuilar-premoiar series of teeth is rather short in i)roportion to 

 that of the premaxillary and maxillary, the diameter from P- to the 

 tip of the premaxillary being 9 mm. longer than the continuous molar- 

 premolar series, while the same measurement of O. longipes shows the 

 diameter in front of P- to be 20 mm. shorter. 



The skull is considerably crushed to one side, but the general fea- 

 tures are well shown and appear to be but \ery little different from those 

 of 0. longipcs or 0. brachydonliis. The external auditory meatus is 

 proportionally smaller than in the latter species. The characteristic 

 fissure of the frontal, which is situated over the orbit, is closed up 

 before it reaches the orbit so that the border of the latter is complete 

 as in Procamelus elrodi Douglass, while in Oxydactylits longipes and 

 other Miocene camels as well as in Po'cbrotherium of the Oligocene 

 this fissure is general!}' open. In recent camels this fissure is also 

 quite generally open. 



Loii'er Jaiv. — Pis. XXX\TI and XXXIX. The inferior borders on 

 the posterior half of both rami are unfortunately missing, but enough 

 is preserved to show that the jaw is very long, quite slender, provided 

 with a long well-coossified sj-mphysis, and a strong angle, while the 

 coronoid process is somewhat lighter than is the case in 0. longipes 

 and 0. brachydontiis. 



Me.\surements of Skull and Lower Jaws. Mm. 



Length of skull from premaxillary to top of occiput 422 



Length of skull from premaxillary to and including M^ 238 



Length of skull from M- to and including the occipital condyle. ... 158 

 Breadth of skull across the zygomatic arches in front of the glenoid 



cavity, approximately 150 



Breadth of skull at M^ 85 



Greatest breadth of muzzle opposite P-, approximately 45 



Breadth of skull at postorbital processes of frontal, approximately 150 



Breadth of occipital condyles 56 



Greatest length of lower jaw, including incisors 358 



Length of lower jaw, from incisors to and including M- 240 



Length of lower jaw, from M- to and including the angle 120 



Depth of lower jaw, from top of coronoid process to inferior border 



of angle, approximately I75 



Depth of lower jaw at diastema between Pj and Pj 28 



