. Geological magazine. Fig. 1.—Skull of Biplodoeus longiis, Marsh (one-sixth nat. size. Side view). The Skull.—The skull of Biplodoeus is of moderate size. Theposterior region is elevated, and narrow. The facial portion is elongate,and the anterior part expanded transversely. The nasal opening is atthe apes of the cranium, which from this point slopes backward tothe occiput. In front of this aperture, the elongated face slopesgradually downward to the end of muzzle, as represented in Pigure 1. Seen from the side, the skull of Diplodocus shows five openings : asmall oval aperture in front (a),
. Geological magazine. Fig. 1.—Skull of Biplodoeus longiis, Marsh (one-sixth nat. size. Side view). The Skull.—The skull of Biplodoeus is of moderate size. Theposterior region is elevated, and narrow. The facial portion is elongate,and the anterior part expanded transversely. The nasal opening is atthe apes of the cranium, which from this point slopes backward tothe occiput. In front of this aperture, the elongated face slopesgradually downward to the end of muzzle, as represented in Pigure 1. Seen from the side, the skull of Diplodocus shows five openings : asmall oval aperture in front (a), a large antorbital vacuity {h), the. Pig. 2.—Diagram of the stuU and hrain-cast of D. longus; seen from above, one-sixth natural size; a, aperture in maxillary; b, antorbital opening; c, nasalopening; c, cerebral hemisphere; d, orbit; e, lower temporal fossa; /, frontalbone; /, fontanelle ; m, maxillary bone; m, medulla ; n, nasal bone ; oc,occipital condyle; ol, olfactory lobes; op, optic lobe ; p, parietal bone; pf,pre-frontal bone; pm, pre-raaxillary bone; q, quadrate bone; qj, quadrate-jugal bone ; I, lachrymal bone. Pro/. 0. C. Marsh—A New American Jurasaic Dinosaur. 101 nasal aperture (c), the orbit {d), and the lower temporal opening {e)(Figure 2). The first of these has not been seen in any otherDinosaur; the large antorbital vacuity is characteristic of the Sauro-poda; and the other three openings are present in all the knownDitiosauria. On the median line, directly over the cerebral cavity of the biain,the type specimen of Biplodocus has also a fontanelle in the , however, may be merely an ind
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