. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 892 TEETH. All the teeth are attached, after the Pleuro- dont type, by their base and outer margin to shallow depressions on the outer side of the external alveolar parapet. The germs of the successional teeth, c. Jig. 570., are developed at the inner side of the base of their predecessors, a, which they excavate, undermine, and displace in the usual manner. Iguanas.—Certain genera of this family of lizards, e. g. Istiiirus, Lophyrus, Calotes, and Otocryptis, have the teeth soldered, like those of Mosftsaurns, to the sum
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 892 TEETH. All the teeth are attached, after the Pleuro- dont type, by their base and outer margin to shallow depressions on the outer side of the external alveolar parapet. The germs of the successional teeth, c. Jig. 570., are developed at the inner side of the base of their predecessors, a, which they excavate, undermine, and displace in the usual manner. Iguanas.—Certain genera of this family of lizards, e. g. Istiiirus, Lophyrus, Calotes, and Otocryptis, have the teeth soldered, like those of Mosftsaurns, to the summit of the alveolar ridge, and thence are called " Acrodonts : " in all these lizards the maxillary and mandibular teeth may be divided into anterior laniary, and posterior molary teeth. In most of the Iguaiiians the teeth are lodged in a common shallow oblique alveolar groove, and are .soldered to excavations on the inner surface of the outer wall of the groove : these are called Pleurodonts. Most of them possess pterygoid as well as maxillary teeth; but the following genera, Jffyperanodon, Tropido- lepis, Phrynosoma, and Callisaurus, are excep- tions. In the Pleurodont Iguanians, the teeth never present the true laniary form ; and if simply conical, as at the extremes of the maxillary series, the cone is more or less obtuse ; but, in general, it is expanded, more or less trilobate, or dentated along the mar- gin of the crown. The Amblyrhynchus, a genus which is some- what remarkable for the marine habits of at least one of the species {Amblyrhynchus atcr), whose diet is sea-weed*, has the tricuspid structure well developed in the posterior teeth. The typical genus of the present family of Saurians (Iguana tubernilala), is characterised by the crenate or dentated margin of the crown of the maxillary and premandibular teeth, a few of the anterior small ones ex- cepted. The pterygoid teeth are arranged in two or three irregular rows, resembling somewhat the " d
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