. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. surface, as to resemble a pavement, as in tlie pharyngeal bones of the Wrasse or Rock-fish (Lahrus, fig. 254) ; or they may be so small, as well as numerous {denies (/run/formes), as to give a granvilated surflice to the part of the mouth to which they are attached (premaxillaries of Cossj/phus).^ A progressive increase of the transverse over the vertical diameter may be traced in the molar teeth of difixjrent fishes, and sometimes in those of the same individual, as in Lahrus, until the cylindrical form is exchanged ibr
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. surface, as to resemble a pavement, as in tlie pharyngeal bones of the Wrasse or Rock-fish (Lahrus, fig. 254) ; or they may be so small, as well as numerous {denies (/run/formes), as to give a granvilated surflice to the part of the mouth to which they are attached (premaxillaries of Cossj/phus).^ A progressive increase of the transverse over the vertical diameter may be traced in the molar teeth of difixjrent fishes, and sometimes in those of the same individual, as in Lahrus, until the cylindrical form is exchanged ibr that of the depressed plate. Such dental j)lates {dentes luinelU- formes) may be found, not only circular, [)ut elliptical, oval, semilunar, sigmoid, ol)- long, or even square, hexagonal, pentagonal, or triangular; and the frrindino- surface may present various and beautiful kinds of sculj)- turino-. The broadest and thinnest lamelli- form teeth are those that form the complex grinding tubercle of the Diodon, fig. 257, b. The front teeth of the Flounder and Sai-gus present the form of compressed plates, at least in the crown, and are dentes incisivi. Palatine bone ri {Silai-as). Numerous wedjie- shaped dental plates {denies cuneati) are set vertically 25t th 253 Handibulnrteolli. liiau'iiillcd iJ'kitiu:!. \. Inferior uliaryii)joall)ono and teeth {LabrnsL v. upper pharyngeal bone of the Parrot-fish {Scants, fig. 255). A thin lamella, slightly curved like a finger-nail, is the singular form of tooth in an extinct genus of fishes, thence called Fetalodus. Sometimes the incisive form of tooth is notched in the middle of the cutting edge, as in Sarr/iis unimaculatus. Sometimes the edge of the crown is trilobate {Aplodactijhis, fio-. 256V Sometimes it is made nulnquelobate by a double I V. pi 45, fig, 1. 11 15 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustration
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