. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. 290 REPTILIA. dans lequel les dents maxillaires supérieure augmentent en taille vers la partie postérieure de l'os, la la grande borne dents de la série sont tra- versé le long de leur côté convexe et antérieure par une rainure longitudinale. Dans le Bucephalus capemis les deux ou trois dents postérieures max- illary présente cette structure, et sont beaucoup plus grandes que les dents antérieures, ou ceux de la série premandibular ou palatine ; ils ajoutent considérablement à la puissance de conserver leurs proies, et peut mener dans les blessures qu'ils infligent

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 290 REPTILIA. in which the superior maxillary teeth increase in size towards the posterior part of the bone, the large terminal teeth of the series are tra- versed along their anterior and convex side by a longitudinal groove. In the Bucephalus capemis the two or three posterior max- illary teeth present this structure, and are much larger than the anterior teeth, or those of the palatine or premandibular series ; they add materially to the power of retaining their prey, and may conduct into the wounds which they inflict an acrid saliva, but they are not in connexion with the duct of an express poison gland. The long grooved fangs are either firmly fixed to the maxillary bones, or are slightly moveable, according to their period of growth : they are concealed by a sheath of thick and soft gum, and their points are directed backwards. The sheath always contains loose recumbent grooved teeth, ready to succeed those in place. In most of the Colubri each maxillary and premandibular bone includes from twenty to twenty-five teeth; they are less numerous in the genera Tortrix and Homalopsis, and are reduced to a still smaller number in the poisonous serpents, in the typical genera of which the short maxillary bone supports only a single perforated fang. In the poisonous serpents the superior Fig. 209.. Roof of the mouth of the Rattlesnake, showing the Series of palatine Teeth. The sheath of the poison fang (11), opened to show the poison fang (12). Oil the opposite side the sheath (1(1) is represented entire; h h, external pterygoid muscles; v v, anterior adductor muscle of the rami of the lower jaw. maxillary bone diminishes in length with the decreasing number of teeth which it supports. The transverse or external pterygoid bone elongates in the same ratio, so as to retain its position as an abutment against the shortened maxillary, and the muscles implanted into this external pterygoid style comm

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