. Bulletin of the Department of Geology. Geology. Vol. 6] Merriam: Virgin Valley and Thousand Creek 293 circumstances one does not seem justified in arbitrarily referring it to /. alexandrae, as that form distinctly differs in several. Figs. 73a and 73b. Ilingoeeros schisoceras, n. sp. Two views of the horn. No. 11893, natural size. Thousand Creek Beds, Thousand Creek, Nevada. Fig. 73a, posterior side; fig. 73b, inner or medial side. characters. In /. alexandrae the spiral ridge which has its origin on the postero-superior region of the orbit, arises anterior to the postorbital process of the
. Bulletin of the Department of Geology. Geology. Vol. 6] Merriam: Virgin Valley and Thousand Creek 293 circumstances one does not seem justified in arbitrarily referring it to /. alexandrae, as that form distinctly differs in several. Figs. 73a and 73b. Ilingoeeros schisoceras, n. sp. Two views of the horn. No. 11893, natural size. Thousand Creek Beds, Thousand Creek, Nevada. Fig. 73a, posterior side; fig. 73b, inner or medial side. characters. In /. alexandrae the spiral ridge which has its origin on the postero-superior region of the orbit, arises anterior to the postorbital process of the frontal. In this form the ridge arising over the orbit is evidently continuous with the postorbital process. In /. alexandrae the horn is almost circular in cross- section ; in this specimen the section is much flattened. Such fragments of horn-cores of I. alexandrae as are available indicate that the horns were considerably elongated, and round in section some distance above the base, having therefore quite a different character from those of this form. For the present, one seems warranted in separating the type represented by specimen 11893 as a species distinct from /. 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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