. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. laminated structure, which is fixed c, teeth still enclosed in the jaw ; I, do. with their extremities ... - . _ - \ff v^v,LUi Ob&AI ^li^lVFO^Vi 111 LrUtJ 1» w» . ' , «*' upon a dilated projection from the protruded so as to form an external pavement. (After Owen.) basilar bone of the cranium (Jig. worn away in front by the constant attrition to ±ig. 515. which they are subjected. In the annexed figure (Jig. 515) the ex- ternal appearance of these singularly disposed teeth is well represented, while in the vertical s
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. laminated structure, which is fixed c, teeth still enclosed in the jaw ; I, do. with their extremities ... - . _ - \ff v^v,LUi Ob&AI ^li^lVFO^Vi 111 LrUtJ 1» w» . ' , «*' upon a dilated projection from the protruded so as to form an external pavement. (After Owen.) basilar bone of the cranium (Jig. worn away in front by the constant attrition to ±ig. 515. which they are subjected. In the annexed figure (Jig. 515) the ex- ternal appearance of these singularly disposed teeth is well represented, while in the vertical section (fig. 516) the mode of their implan- tation into the anterior surface of the jaw is delineated. All these teeth were originally developed in a common alveolar cavity (516, c) situated in the substance of the jaw. The outer* wall of this cavity is much weaker than the dense and compact inner wall, and moreover it becomes thinner as it approaches the margin of the jaws and disappears (fig. 516, /,) at different distances in different spe- cies of Scari before it reaches that margin. Where it exists at the base of the jaws it is sometimes, as in Scarus muricatus represented in the figure, perforated by numerous small foramina, through which foramina in the recent fish processes of the external periosteum are continued to the analogous membrane lining the dentigerous cavity and forming the capsule of each denticle. These processes are analo- gous to the gubernacula of the second series of teeth in the Mammalia, and like them serve to conduct the new teeth to the exterior of the jaw. The growing denticles (516, /,) be- * Owen, Odontography, page 115. 3 R 2. Beak of Parrot-fish (Scarus muricatm). a, upper mandible, the exterior of which is com- pletely encased in teeth ; 6, lower mandible par- tially so, the inferior teeth not having as yet pro- truded ; c, lateral fangs. (After Owen.). Please note that these images are extracted from scanned page images that may have bee
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