. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. TEETH OF REPTILES. 397 the centre of a great part of the tooth, is really on the outside of the tooth, the canal in which it is lodged and protected Ijeing formed by a longitudinal inflection of the dentinal parietes of the pulp-cavity, fig. 270, c. This 269 inflection commences a little beyond the base of the tooth, where its nature is readily apjireciated, as the poison- duct there rests in a slight groove or longitudinal inden- tation on the convex side of the fang, fig. 269, A, B, v; as it proceeds it sinks deeper in
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. TEETH OF REPTILES. 397 the centre of a great part of the tooth, is really on the outside of the tooth, the canal in which it is lodged and protected Ijeing formed by a longitudinal inflection of the dentinal parietes of the pulp-cavity, fig. 270, c. This 269 inflection commences a little beyond the base of the tooth, where its nature is readily apjireciated, as the poison- duct there rests in a slight groove or longitudinal inden- tation on the convex side of the fang, fig. 269, A, B, v; as it proceeds it sinks deeper into the substance of the tooth, and the sides of the groove meet and seem to coalesce, so that the trace of the inflected fold ceases, in some species, to be percej^ti- ble to the naked eye; and the fang appears, as it is commonly described, to be jJerforated by the duct of the poison-gland. In the Hi/drophis the groo^'c remains permanently ojien, as in 269, C. poison-canal it follows that. roison-faiigs of A, vipi?r ; b, Oulira fin section); c. Hyai-oiibi,?. V. fig. the 270 From the position of the transverse section of the tooth varies in form in dif- ferent parts of the tooth : at the base it is oblong, with a large pulp-cavity of a cor- responding form, with an entering notch at the ante- rior surface, fig. 268, c; farther on, the transverse section presents the form of a horseshoe, and the pulp- cavity that of a crescent, the horns of which extend into the sides of the deep cavity of the poison-fang: a little beyond this part the sec- tion of the tooth itself is crescentic, with the horns obtuse and in contact, so as to circum- scribe the poison-canal; and along the Avhole of the middle four. 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 Owen, Richard, 1804-1892; Cornell University. College of Veterina
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