. Bulletin of the Department of Geology. Geology. 1921] Frick: Faunas of Bautista Creek and San Timoteo Canon 329 Pliohippus francescana resembles the considerably smaller horse (see below) occurring in the same horizon: (1) in the general propor- tions of the protocone, slight amount of the projection of its anterior corner, and the circular protocone section of the premolars: (2) in the relative simplicity of the borders of the cement lakes. It differs mark- edly from the smaller form by the much greater size and accompanying heaviness of its styles as contrasted with the thin and slender on
. Bulletin of the Department of Geology. Geology. 1921] Frick: Faunas of Bautista Creek and San Timoteo Canon 329 Pliohippus francescana resembles the considerably smaller horse (see below) occurring in the same horizon: (1) in the general propor- tions of the protocone, slight amount of the projection of its anterior corner, and the circular protocone section of the premolars: (2) in the relative simplicity of the borders of the cement lakes. It differs mark- edly from the smaller form by the much greater size and accompanying heaviness of its styles as contrasted with the thin and slender ones of. Figs. 38a to 396. Pliohippus francescana minor, n. subsp. Upper cheek teeth, X 1. Fig. 38a, F-% no. 23275, referred to type, inner view with section; fig. 38b, same tooth, occlusal view; fig. 39a, P^, no. 23263 of type specimen, occlusal view; fig. 39b, Mi, no. 23264 of type specimen, occlusal view. San Timoteo beds, Cali- fornia. the latter, the great size of its lakes, and the comparative broadness of the postprotoconal valley of and (versus the constriction of the same in the smaller form). The interesting similarity of the larger to the smaller series and their several strong points of common primitiveness point either: (1) to a parallel development of two dis- tinct forms of advanced Pliohippus type associating in the same range ; or (2) to an exceptional sexual variation. The writer has placed the small form, pending the securing of additional material, under the name P. francescana Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of California, Berkeley. Dept. of Geology. Berkeley : The University Press
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