. Bulletin - United States National Museum. Science. OSTEOLOGY OF CARNIVOROUS DINOSAURS. 19 Viewed from the side this end is ovally emarginated, thus forming the nasal contri- bution to the boundaries of the external narial opening. On the median ventral side the bone is traversed longitudinally bj' a shallow groove that marks the union of the nasal with the underlying maxillary. At the center and external to this groove the nasal overhangs the external surface of the maxillary, instead of rounding evenly into it as m most dinosaurian skulls. On the underside of this overhanging portion is one
. Bulletin - United States National Museum. Science. OSTEOLOGY OF CARNIVOROUS DINOSAURS. 19 Viewed from the side this end is ovally emarginated, thus forming the nasal contri- bution to the boundaries of the external narial opening. On the median ventral side the bone is traversed longitudinally bj' a shallow groove that marks the union of the nasal with the underlying maxillary. At the center and external to this groove the nasal overhangs the external surface of the maxillary, instead of rounding evenly into it as m most dinosaurian skulls. On the underside of this overhanging portion is one large opening, flanked by two smaller ones, that lead into connecting chambers within the heavier part of the bone. As observed in several of the larger elements of the skull, these chambers are evidently a provision of nature for getting the maximimi strength from a minimum weight of bone, a feature that goes well with the light and open structure of the 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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