. FiCJ. 1. Skull of Diplodocus longiis ilai-sh. One-sixth natural size ; seen from below ; b. basioecipital process; eo, exoecipital ; hi, maxillary; mp. maxillary plate; o, occipital condyle; p, palatine; pm, pre- maxillaiy ; pt, pterygoid ; ps, parasphenoid ; q, quadrate ; f, transvei'se bone ; v, vomer. xVfter Marsh. slopes backward from the occiput. In front of this aperture the elongate face slopes gradually downward to the end of the muzzle, as shown in PI. II., Fig. ; "Seen from the side the skull of Diplodocns shows five openings: a small oval aperture in front, a large ant


. FiCJ. 1. Skull of Diplodocus longiis ilai-sh. One-sixth natural size ; seen from below ; b. basioecipital process; eo, exoecipital ; hi, maxillary; mp. maxillary plate; o, occipital condyle; p, palatine; pm, pre- maxillaiy ; pt, pterygoid ; ps, parasphenoid ; q, quadrate ; f, transvei'se bone ; v, vomer. xVfter Marsh. slopes backward from the occiput. In front of this aperture the elongate face slopes gradually downward to the end of the muzzle, as shown in PI. II., Fig. ; "Seen from the side the skull of Diplodocns shows five openings: a small oval aperture in front, a large antorbital vacuity, the nasal aperture, the orbit, and lower temporal opening. The first of these has not been seen in any other Sauropoda, the large antorbital vacuity is characteristic of the Tlieropoda also, while the other three openings are present in all the known Dinosauria. "On the median line, directly over the cerebral cavity of the l>rain, the type specimen of Dlphuhivus has also a fontanelle in the parietals. This, however, may be an individual peculiarity. "The plane of the occiput is of moderate size, and forms an angle with the fronto-parietal surface. ^The skull of Diplodocus reported in Science, Nov. 9, 1900. p. 718, when freed from the matrix proved to belong to Stegosaurus. 5Part I., Sixteenth Annual Report, U. S. G. S., pp. 14:5-244, Plates 2-8.'), with GO text figiu-es. ''References to plates and figures are altered to agree with numbei-s for the same in the present paper.


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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdiplodo, bookyear1901