. Figure 13.—Posterior surface of skull of Dinoceras mirahile, Marsh (No. lOSfi). Figure 14.—Posterior surface of skull of Dinoceras latkeps, Marsh (No. 1039), male. Figure 15.—Posterior surface of skull of Dinoceras agresie, Marsh (No. 1221). Figure 16.—Posterior surface of skull of Tinoceras afflne, Marsh (No. 1574) Figure IT.—Posterior surface of skull of Ti:o~.eras ingens, Marsh (No. 1041). Figure 18.—Posterior surface of skull of Tinoceras pugnax, Marsh (No. 1044). c. occipital condyle; /. foramen magnum; I. lateral crest; o. occipital crest; p. post-tympanic process; l. crest behind temp


. Figure 13.—Posterior surface of skull of Dinoceras mirahile, Marsh (No. lOSfi). Figure 14.—Posterior surface of skull of Dinoceras latkeps, Marsh (No. 1039), male. Figure 15.—Posterior surface of skull of Dinoceras agresie, Marsh (No. 1221). Figure 16.—Posterior surface of skull of Tinoceras afflne, Marsh (No. 1574) Figure IT.—Posterior surface of skull of Ti:o~.eras ingens, Marsh (No. 1041). Figure 18.—Posterior surface of skull of Tinoceras pugnax, Marsh (No. 1044). c. occipital condyle; /. foramen magnum; I. lateral crest; o. occipital crest; p. post-tympanic process; l. crest behind temporal fossa. All the figures are one-eighth natural size. In Dinoceras mirabile (number 1036), the occiput is remarkably rectangular in outline, as shown above in figure 13. Its general surface is concave, for the attachment of the powerful muscles and


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