. Bulletin of the Department of Geology. Geology. 258 University of California Publications. [Geology species was very difficult. As shown by Gidley the lower milk molars of Hypohippus, as represented by this form, are dis- tinguished from those of Mesohippus by the heavier and better developed external basal cingula, the protoconid and hypoeonid being fuller and wider transversely, and the teeth more special- ized in general. Especially is the advanced development notic- able in lower milk molar two in Hypohippus "in which the anterior external cusp has attained a completely crescentic f
. Bulletin of the Department of Geology. Geology. 258 University of California Publications. [Geology species was very difficult. As shown by Gidley the lower milk molars of Hypohippus, as represented by this form, are dis- tinguished from those of Mesohippus by the heavier and better developed external basal cingula, the protoconid and hypoeonid being fuller and wider transversely, and the teeth more special- ized in general. Especially is the advanced development notic- able in lower milk molar two in Hypohippus "in which the anterior external cusp has attained a completely crescentic form similar to that of the posterior cusp, while in Mesohippus this tooth has but one crescent, or V, the posterior ; Mlt the only permanent tooth represented in specimen 10665, described by Gidley, is slightly larger than the teeth of H. equiuus and is a little smaller than in H. affinis. It is of almost. Figs. 28a and 286. Hypohippus, near osborni Gidley. Lower jaw with dentition. No. 12587, X %. Virgin Valley Beds, Virgin Valley, Nevada. Tig. 28a, outer side; fig. 28b, superior 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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