R. 8. Lull — Fauna of the Dallas Sand Pits. 171 



relatively somewhat further forward. The infra-orbital 

 foramen of the left side only is preserved, and this lies 

 ■just above the anterior crescent of M^ in seeming corre- 

 spondence with that of C. huerfanensis ; in both living 

 genera the foramen lies a little further forward, above 

 P^. The premaxillaries are broader and heavier in the 

 Dallas specimen than in either of the recent genera. 



One apparent distinction between the Dallas form and 

 the type of Camelops huerfanensis lies in the position of 

 the canine, which ^^must have emerged immediately 

 behind the incisor just as it does in the Bactrian cameP^ 

 (Hay, p. 269). The Dallas specimen has an incisor- 

 canine diastema of 16 mm. on the left and 18 mm. on the 

 right. 



Measurements of Skull. 



12 3 



mm. Eatio mm. Eatio mm. 



Length over all 500 1.08 540* 



Height of occiput from up. margin of 



foramen mag 68 1.00 68 



Breadth of occiput on line through 



lateral foramina 123 1.01- 124 1.12 110 



Palate, width between P^ 35 1.15 40 1 0.80 50 



Width in front of M^* 72 0.96 69t 0.79 87 



Width, premax. border to rear of 



M-' 315 1.08 340 



Length, premolar-molar ser., P=^-M=\ . 151 1.14 172.5 1.01 171 



Teeth, front of P* to rear of M^ . 130 1.19 154.5 1.16 152 



Molar ser 109 1.18 129 1.00 129 



P^ length 20.5 1.02 21 1.12 18.8 



P^ length 24 1.14- 27.3 1.09 25 



M^ length 34.5 1.07 37 0.96 38.5 



M^ length 44 0.97- 42.5 0.88 48 



M^ height 22 25.51 62 



Length on grinding surface 43 1.21 52 1.15 45 



Width 27 1.00 27 0.94- 28.5 



Average ratios 1.08 1.00 



1 = Camelus araticus, Cat. No. 01552, Y. P. M. 



2 z=z Camelops huerfanensis dallasi, subsp, nov.. Cat. No. 1.51, S. M. U. 



3 = Camelops huerfanensis, Cat. No. 7819, U. S. N. M., after Hay. 



* Estimated. 



t Eestored. 



t In the Dallas specimen the teeth are much more worn, hence heights are 

 much less, and as the teeth are worn, the length (ant.-post. diameter) dimin- 

 ishes (except in the third premolar and the last molar), while the transverse 

 diameter increases (Hay). This will account for most of the discrepancies. 



Cervical vertebra VI. — A single well preserved cervi- 

 cal vertebra, No. 1.57, S. M. U., is present and appears to 



