344 University of California Publications in Geology [Vol. 12 



First molar. — The referred first molar (no. 24026, figs. 51a-51c) is 

 little worn. The anterior inner corner of the specimen is broken, and 

 the tip of the main posterior cusp is missing. The transverse width of 

 this tooth is slightly more than the anteroposterior, which is greatest 

 externally. The specimen is furnished with two strong, pyramidal- 

 shaped outer cones, the paracone and metacone, and a low, diagonally 

 directed, inner ridge, which slopes outward and upward from the inner 

 posterior margin of the tooth border, and is divided from the main 

 cones by a broad valley. This ridge at its central point is equidistant 

 from the tooth's inner border and an imaginary line joining the tips 

 of the main cones. A slight rugosity of the exterior side of the speci- 

 men takes the form of cingula at its slightly projecting posterior, and 

 at its squared anterior corners, where the cingulum is the most promi- 

 nent. These anterior and posterior cingula are joined laterally by 

 wings from the inner ridge. A very slight concavity occurs in the 

 external border opposite the valley that divides the two main cones. 

 The mid-anterior extremity of the tooth, unlike the mid-posterior 

 margin, is slightly indented. The specimen apparently had three roots, 

 two outer and one inner. 



Small carnassial. — In its small size this tooth (no. 24027, figs. 50a, 

 506), differs markedly from the type specimen. It is considerably less 

 worn than the first carnassial, a wide valley still separating the deutero- 

 cone from the outer main cones. The protostyle lies directly anterior 

 to the protocone, as in the large specimen, and the proportions of the 

 cusp are similar to those of the first tooth. This smaller referred tooth 

 is at present believed to represent no more than a marked sexual 

 variation, being in general form and relative proportion in all respects 

 identical -with the type specimen. In its well preserved and unworn 

 state the normal tooth pattern is readily seen, the characters support- 

 ing those noted in the larger tooth as follows: (1) the unusual size 

 of the protostyle which almost equals that of the protocone; (2) the 

 considerable anterior pi^ojection of the deuterocone; (3) the outer and 

 strong inner cingula; (4) the great relative size of the posterior root, 

 and the proportionate naiTOwness of that of the tritocone. 



