. Bulletin of the Department of Geology. Geology. Vol. 6] Merriam: Virgin Valley and Thousand Creek. 261 No. 10665 irior diameter 24. 22 23. P4, transverse MlT anteropost M„ transverse diamete Ivi M2, anteroposterior M,, transverse H. H. H. No. No. osborni equina s affinis 12587 11760 24. 22 23. 14 21. 23 22 22 2 14 20. 16. 22 21. 12 25 25. 15. 10 13. PARAHIPPUS, compare AVUS (Marsh) Several lower cheek teeth from Virgin Valley (figs. 29a to 29r) represent a species of Parahippus larger than Parahippus crenidens of the
. Bulletin of the Department of Geology. Geology. Vol. 6] Merriam: Virgin Valley and Thousand Creek. 261 No. 10665 irior diameter 24. 22 23. P4, transverse MlT anteropost M„ transverse diamete Ivi M2, anteroposterior M,, transverse H. H. H. No. No. osborni equina s affinis 12587 11760 24. 22 23. 14 21. 23 22 22 2 14 20. 16. 22 21. 12 25 25. 15. 10 13. PARAHIPPUS, compare AVUS (Marsh) Several lower cheek teeth from Virgin Valley (figs. 29a to 29r) represent a species of Parahippus larger than Parahippus crenidens of the Deep River Beds or P. brevidens of the Mascall, but corresponding approximately in size to P. nebrascensis de- scribed by Peterson17 from the upper Harrison Beds. This species should lie compared with the doubtful Parahippus avus (Marsh) from the Pigs. 29« to 29c. Parahippus, compare avus (Marsh). No. 39403, nat- ural size. Pig. 29a, outer view; fig. 29b, occlusal view; fig. 29c, inner view. Virgin Valley Beds, Virgin Valley, Nevada. The crowns of the lower cheek teeth are short and the enamel is quite rough. On all of the specimens there is evidence of a considerable covering of cement. On the outer side there is a distinct shelf developed on the cingulum, and a small basal tubercle is present between the protoeonid and hypoconid. The metaconid and metastylid pillars are distinctly separated. The entoconid pillar is also large and the entostylid is well developed. The development of the metaconid, metastylid, and entoconid pillars tends to narrow the inner ends of the anterior and pos- terior valleys much more than in Hypohippus. A characteristic 17 Peterson, O. A., Ann. Carneg. Mus., vol. 4, p. 57, 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.
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