. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. TEETH. of the transverse over the vertical diameter may be traced in the molar teeth of different fishes, and sometimes in those of the same individual, as in Labnts (Jig. 564*.), until the cylindrical form is exchanged for that of the depressed plate. Such dental plates (denies lamelliformes) may he found, not only circular, but elliptical, oval, semikmar, sigmoid, oblong, or even square, hexagonal, pentagonal, or tri- angular ; and the grinding surface may present various and beautiful kinds of sculpturing. The broades
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. TEETH. of the transverse over the vertical diameter may be traced in the molar teeth of different fishes, and sometimes in those of the same individual, as in Labnts (Jig. 564*.), until the cylindrical form is exchanged for that of the depressed plate. Such dental plates (denies lamelliformes) may he found, not only circular, but elliptical, oval, semikmar, sigmoid, oblong, or even square, hexagonal, pentagonal, or tri- angular ; and the grinding surface may present various and beautiful kinds of sculpturing. The broadest and thinnest lamelliform teeth are those that form the complex grinding tubercle of the Diodon.* The front teeth of the Flounder and Sargus present the form of compressed plates, at least in the crown, and are true dentcs inclsivi. Numerous wedge- shaped dental plates (denies cuneati) are set vertically in the upper pharyngeal bones of the Parrot-fish (Scants, fig. 565.). A thin Fig. Superior pharyngeal bones and teeth (Seams'). lamella, slightly curved like a finger-nail, is the singular form of tooth in an extinct genus of fishes, which I have thence called Petalodns. Sometimes the incisive form of tooth is notched in the middle of the cutting edge, as in Sargits unimaculatus. Sometimes the edge of the crown is trilobate (Aplodactyhts, fig. 566.). Fig. 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 Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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