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University of California Publications in Geology 



[Vol. 8 



acter of the protocone, but not in the nature of the fossettes. It 

 agrees approximately in structure with specimens of Merychippus- 

 like forms of the Barstow fauna, but is not clearly separable from 

 an undescribed species of the Merychippus zone in the "Temblor" 

 beds north of Coalinga on the west side of the San Joaquin Valley. 3 

 The cement covering is possibly a little thicker than on the "Temblor" 

 form. 



Fig. 1. Merychippus, sp. Upper cheek-tooth, posterior and occlusal views, 

 natural size. From west side of Comanche Creek, Tejon Hills, at the southern 

 end of the San Joaquin Valley, California. (Lower division?) 



Fig. 2. Merychippus, sp. P 4 ?, outer and occlusal views. No. 21484, natural 

 size. From Comanche Creek, Tejon Hills, southern end of the San Joaquin Valley, 

 California. (Lower division?) 



Fig. 3. Hipparion or Merychippus, sp. M/?, outer and occlusal views. No. 

 21566, natural size. From the south side of Tejon Creek, Tejon Hills region, 

 southern end of the San Joaquin Valley, California. (Upper division?) 



A lower tooth, P 4 ?, no. 21484 (fig. 2), collected at Comanche 

 Creek, locality 430, in the Tejon Hills, by R. C. Stoner is not larger 

 than P 4 of an undescribed Merychippus from the Barstow fauna, 

 and has much the same roughened surface. The metaconid-metastylid 

 column is of the anteroposteriorly short Merychippus type, but is a 

 little more flattened than in average specimens of that group. The 

 valleys anterior and posterior to this column are much narrower trans- 



s See Merriam, J. C, Science (n.s.), vol. 40, pp. 643-645, 1914. 



