

B. alleni 





No. 1.53 



Eatio 



S. M. U. 





mm. 



1.03 



dzl81* 



1.05 



± 63 



1.04 



118 





19t 



1.00 



25 



1.00 



30 



1.00 



± 35$ 



1.04 



50 



168 R. 8. Lull — Fauna of the Dallas Sand Pits. 



Measurements. 



Bison alleni 



No. 7706 



U. S. N. M. 



mm. 



Length, premolar-molar series 175 



Premolar series 60 



Molar series 113 



P3, length 22 



P^, length 25 



Ml, length 30 



M2, length 35 



M3, length 48 



Average ratio 1.02 



* Measured to alveolus of P2. 

 t Alveolus, tooth lacking. 

 t Broken. 



Camelops huerfanensis dallasi, subsp. nov. 



(Figs. 4, 5.) 

 Holotype, Cat. No. 1.51; paratjpes, Cat. Nos. 1.53, 1.57, 1.58, 1.59, 1.60, 

 S. M. U. Pleistocene, Lagow sand pit, Dallas, Texas. 



The material consists of a broken bnt otherwise 

 admirably preserved skull, a cervical and a dorsal ver- 

 tebra, right ulno-radius, astragalus, and metatarsal, the 

 last incomplete. These remains indicate an animal about 

 the stature of a modern Arabian camel or dromedary, as 

 the relative measurements will show. 



Skull. — The skull (holotype) consists of three separate 

 portions: the palate with the right dentition complete 

 from the third incisor back, the left partially so ; the rear 

 of the cranium, including the basi-occipital region and 

 the parietal bones; and a detached, incomplete right 

 frontal. 



The occiput approximates that of the dromedary 

 (Camelus arabicus, Cat. No. 01552, Y. P. M.), in size, but 

 differs in the greater proportionate width, larger con- 

 dyles, lighter and less overhanging nuchal crest, and in 

 the deeper modeling of the occipital surface. The 

 mastoid region differs markedly in the two forms, appar- 

 ently correlated with the relative development of cervical 

 VI (see below). The paroccipital process is larger in 

 the fossil and points more nearly toward the rear, while 



