768 PROCEEDINGS OF THE NATIONAL MUSEUM. 



larly by its leiijitli, which is 0.340 mm., or about one-seventh hunger 

 than tliat of the metacarpal ascribed to />. er<(ssicor)iis. Posteriorly it 

 is more convex and rugose near the proximal extremity than the meta- 

 cari)al of any other bison examined, but this may be an individual 

 peculiarity. 



Two of the teeth are third upi)er molars, one from the left and one 

 from the right side, and one is a second upi)er i)remolar from the right 

 side. The premolar and one molar are large and massive, correspond- 

 ing in character with teeth previously assigned to B. latifrons, though 

 not exceeding in these respects the largest teeth of 7>'. hisoti. The 

 other molar is smaller and probably came from a female. 



Four teeth contained in iragments of the lower jaw, obtained by Mr. 

 R. T. Hill on Onion Creek, Travis County, Texas, are luovisionally 

 referred to />. latifrons. The jaw when entire was longer than that of 

 />, bison and much more massive, the portion containing the last molar 

 being very thick and heavy. On the other hand, the jaw is lighter and 

 the teeth smaller than in />'. antiqmifi from California. 



Any statements, however, regarding teeth of fossil bison must be 

 made and accei)ted with caution, as so far teeth and horn cores have 

 not been found associated excei)t in the case of />. Imon. The longitu- 

 dinal diameters of the teeth sliglitly exceed those of the corresponding- 

 teeth of B. bison, but the transverse diameters are much greater, the 

 general {ipi)earance of the teeth being stout and massive, a charaiiter 

 brought out nuicli better by a direct comparison of specimens than by 

 a comparison of their respective measurements. 



In regard to the jaw from Texas, Mr. R. T. Hill writes: 



It was lound in the banks of a little lateral ilowinj;- northward into Onion Creek, 

 abont 2 miles west of Pilot Knob, Travis County, Texas. It conies from an exten- 

 sive formation which I am calling the Onion Creek formation, having wide dovelop- 

 mont over the HtnU' of Texas. As an ancient marly alluvium of the older drainage, 

 and for other reasons tlian this bone, I consider it to bo the equivalent of the E(|uus 

 beds, or early I'leistocene. 



Mr. W. P. Blake's Bos arizonica^ is referable to this species, as may 

 be seen by his descri])tion and measurements. That the horns curved 

 downward and forward is an inference probably due to the condition 

 of the specimen on which lios arizoniea is based. The measurements of 

 the horn cores are given in the table, and it will be seen that they har- 

 nu)nize perfectly with the measurements of other specimens of the 

 species. That it should be found in Arizona agrees ])erfectly with the 

 little that is known of its geograi)hical distribution. The specimen was 

 found at Greaterville, in the Pima Mountains, and is now in the 

 Museum of the University of Arizona. 



Remains ascribed to Bison latifrons have been found as follows : 

 . Peace Creek, Florida. Teeth. 



' Remains of a species of Boa in the Quaternary of Ari/ona. Am. Geologist, XXll, 

 August, 1898, pp. 65-71. 



