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University of California Pxiblications in Geology 



[Vol. 12 



cusps in each tooth are well notched. The anterior of the two crests 

 is much broader transversely and a trifle higher than the posterior. 

 A comparison of the two teeth shows the forward crests of both to be 

 of about equal size, but the higher crest of the second to be slightly 

 less developed than that of the first tooth. The triturating edges of 

 the first tooth are slightly worn, those of the second show no sign of 



Figs. 26 to 28. Tapirus merriami, n. sp. Portion of mandible with lower teeth, 

 no. 23519. Fig. 26, fragment of mandible with teeth in position as found, X %. 

 Figs. 27a, 27&, and 27e, Mj, occlusal, outer and anterior views respectively; fig. 28, 

 Mj, occlusal view, natural size. Bautista beds, California. 



wear, and the enamel of the whole is correspondingly dull and rugose 

 instead of bright and polished as it is in the first tooth. The second 

 tooth evidently occupied a position posterior to the first, and had not 

 yet come into function. The first tooth is believed to represent M-, 

 the second M-. The anterior extremity of each specimen is crossed 

 by a typically low. inward-plunging ridge rising from the lower por- 

 tions of the two anterior cones (the protoconid and metaconid). 

 Tapiroid cingula occur at the exterior corner of these low ridges and 

 at the posterior base of the second of the main transverse crests. In 

 M- the low ridge is apparently more confluent with the wing of the 

 protoconid, and the adjacent cingidum better developed than in M-. 



