400 R. S. Lull — New Camels in 



crowns, and are preceded and followed by diastemata of 

 less extent than in the npper jaw. No other peculiarities 

 are to be noted, except that there is a low basal pillar 

 between the two outer crescents of M^ corresponding to 

 those between the inner crescents of M- and ]\P. The 

 character of the enamel corresponds to that of the upper 

 dentition. The jaw is slender, with a nearly straight 

 inferior margin, except toward the symphysis, where it 

 is deflected downward. The mental foramen lies beneath 

 the anterior Pj. The preserved portions of the limb 

 bones and dorsal centra show nothing distinctive. 



Measurements of lower jaw No. 10922. 



mm. 



Length, P, to M, 85.0 



First Pi, ant.-post. length 5.8 



Second P^, ant.-post. length 7.7 



Diastema, P^ to P., 12.3 



P., length ." 9.2 



P3, length 11.3 



M2, length, ant.-post 15.5 



Mo, transverse diameter 10.6 



M3, ant.-post. diameter 21.6 



Mg, transverse diameter 10.0 



Depth of jaw at P,.^ diastema 14.4 



Depth of jaw outside beneath ant. part M., 24.5 



Thickness of jaw beneath ant. part M3 13.0 



Paratylopus wortmani, sp. nov. 



(Fig. 5.) 



Holotype, Cat. Xo. 10884, Y. P. M. Upper Oligoceiie (upper John Day), 

 Haystack valley, John Day Eiver, Oregon. 



The material npon which this new species is based 

 consists of the anterior part of the npper jaws, four 

 cervical vertebrae, humeri, ulno-radius, carpalia, metacar- 

 palia, distal ends of both femora, proximal end of a tibia, 

 and portions of both metatarsals. The premaxillaries 

 are preserved, together with the maxillaries back as far 

 as the root of the left P-. 



Distinctive characters. — The incisors were all present, 

 P being the largest, caniniform, and separated by a long 

 diastema from the true canine tooth. In P. cameloides, 

 this diastema must have been very short, as there is none 



