172 R. S. Lull — Fauna of the Dallas Sand Pits. 



be of the same level as that of the skull. It is very 

 remarkable for the huge development of the ventral 

 branches of the transverse processes, which are deflected 

 downward to such an extent that their axes are parallel. 

 These processes are of less fore and aft extent than in the 

 dromedary, but are much thicker and deeper. The 

 centrum of the vertebra, on the other hand, is more 



Fig. 5. — Cervical of (A) Camelus arabicus, Cat. No. 01552, Y. P. M.; and 

 (B) Camelops huerfanensis dallasi, subsp. nov. Paratype, Cat. No. 

 1.57, S. M. U. X V4= 



slender in the fossil, which gives the forward articular 

 surface especially a somewhat less area. The planes of 

 the two centrum faces are not parallel, but indicate a 

 marked upward flexion of the neck, more so than in the 

 equivalent element of the dromedary (see fig. 5). 



Dorsal vertebra. — A first dorsal. Cat. No. 1.60, S. M. 

 U., perfect except for the spinous process, is also present. 

 It shows signs of stream transportation (and doubtless 

 comes from the lower level). It approximates the equiv- 

 alent bone of the dromedary (01552, Y. P. M.) in size, but 

 differs in having a somewhat heavier neural arch and 

 shorter, broader centrum with a flatter ventral aspect. 



Measurements of Vertehrce. 





Camelus 





Camelops 





arabicus 





huerfanensis 





No. 01552 





dallasi 





Y. P. M. 





No. 1.51, S. M. C 





mm. 



Ratio 



mm. 



3rvical VI : 









Length of centrum . . . 



142 



1.03 



146 



