Peterson : Osieolcxjv ok Oxvdactvlus. 



445 



slVaped anterior extremity. The position of their anterior border is 

 also variable. Furthermore, the palatine fossa in different individuals 

 varies in dei)th. (See Figs, i and 2.) Other differences might be 

 pointed out, but they are less noticeable and are not very likely to 

 be used in distinguishing one species from another. 



From the observations noted above it may easily be seen how mis- 

 takes are unintentionally and sometimes unavoidably made in refer- 

 ring fragmentary material to the proper species or even genus. 



Comparative Measurements of the Skull and Teeth. 



O. longipes. C. bactrianns. L. luianaco. 



Greatest length of skull 340 mm." 540 mm. 305 mm. 



Occipital condyle to apex of premaxillaries 318 mm. 496 mm. 287 mm. 



Greatest expanse of skull at postorbital processes 126 mm. 241mm. 150 ram. 



Length of sagittal crest 95 mm.' 100 mm. 45 mm. 



Length of nasals, median line 98 mm. 45 mm. 



Length of palate from posterior 



Length of nares to apex of premaxillaries 1S2 mm. 281 mm. 150 mm. 



Greatest breadth of palate including alveolar 



borders at m. 3 85 mm. 154 mm. 85 mm. 



Greatest constriction of palate back of pm. i 20 mm. 31 mm. 17 mm. 



Length of continuous molar-premolar series 102 mm. 152 mm. 70 nmi. 



Length of diastema between incisor 3 and the 



canine 13 mm. 10 mm. 18 mm. 



Length of diastema between canine and pm. i .. 14 mm. 25 mm. 



Length of pm. I antero-posteriorly 9 mm. 



Length of diastema between pm. i and pm. 2 .. 18 mm. 

 Distance from canine to continuous molar-pre- 



molarseries 40 mm. 91mm. 55 mm. 



Length of pm. 2 11 mm. 



Greatest breadth of pm. 2 6 mm. 



Greatest length of pm. 3 14 mm. 16 mm. 



Greatest breadth of pm. 3 20 mm. 15 mm. 



Greatest length of pm. 4 14 mm. 23 mm. 10 mm. 



Greatest breadth of pm. 4 10 mm. 22 mm. 13 mm. 



Greatest length of m. i 19 mm. 34 mm. 16 mm. 



Greatest breadth of m. 1 16 mm. 31mm. 21mm. 



Greatest length of ni. 2 23 mm. 44 mm. 21 mm- 



Greatest breadth of m. 2 20 mm. 31mm. 21mm. 



Greatest length of m. 3 25 mm. 45 mm. 26 mm. 



Greatest breadth of m. 3 20 mm. 25 mm. 20 mm. 



Distance from apex of premaxillaries to anterior 



margin of orbit 180 mm. 250 mm. 165 mm. 



' This indicates the length measured by comparison with other individuals. 



