1921] Frick: Faunas of Bautista Creek and San Timoteo Canon 361 



Alticamchis.*'^ Though the general appearance of the anterior teeth 

 is somewhat similar to that of A. procerus, the teeth are markedly 

 heavier, the mandible is proportionately more elongate, and the relative 

 length of the posterior diastema suggests the loss of possibly both 

 P2 and P-j. The general characteristics of the forms are too far apart 

 (see below) to attempt to refer the tooth remnant tCi P5 of either 

 the genus Camelops or the genus Auchcnia. On the one hand, the 

 specimen might represent Pj of Pliauchenia ; the proportions are 

 apparently not unlike those of the comparatively small Pj of P. spatula 

 Cope*^ from the Blanco, or even more like the less reduced Pr; of 

 Dr. Matthew's P. gigas of the Snake Creek. On the other hand, it 

 well agrees with the form of P-4- of the genus Caniclus, such as seen 

 in the smaller C. amcricanus, both teeth being bilobed, double fanged. 

 and of proportionate width and height of crown. That the tooth 

 might represent Canielus is fiirther suggested by the presence in the 

 collection of a large, triangular shaped, upper premolar (no. 23416, 

 fig. 69) somewhat resembling P^ of C. hactriainis. Tlie transverse 

 thickness of the posterior portion of this premolar exceeds that of the 

 C. bactrianus tooth; the anterior portions of the two are both sharply 

 triangular. 



In conclusion, it would thus seem that the remnant of the first 

 cheek tooth might very possibly represent either a P^ of a form 

 resembling the genus Camclus, or Pt; of some Pliauchcnia-Wke species. 



COMPAEATIVE MEASUREMENTS OF THE TEETH 





Pliauchenia? 

 merrianii, 



T.vpe, 

 no. 23483 



Camelus 

 dromedarius, 

 Univ. Calif. 



Coll. Vert. 



Pal. 22843 



T3, anteroposterior diameter 



19.7 mm. 





I-, transverse diameter 



13 





C, anteroposterior diameter 



20 



20 mm. 



C, transverse diameter 



12.9 



16.5 



Pi, anteroposterior diameter 



15.2 



13.5 



P-, transverse diameter 



9 



10 



I3, anteroposterior diameter 



20 



16.5 



I5, transverse diameter 



10.5 



12 



Length of diastema anterior to canine ... 



. 23 





Length of diastema posterior to canine... 



. 30 



20 



*« Matthew, W. D., and Cook, H. J. A Pliocene Fauna from Western Nebraska. 

 Bull. Am. Mus. Nat. Hist., vol. 26, pp. 403-406, figs. 19, 20, 1909. 



■*7 Cope, Edw. D. A Preliminary Eeport on the Vertebrate Palaeontology of 

 the Llano Estacado. 4th Ann. Kept. Texas Geol. Surv., pp. 70-73, pi. 21, figs. 

 1, 2 (1892), 1893. 



