. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Teeth of the Tench. a, roof of the mouth ; b, the oesophagus ; c, dental projection from basilarbone j d, d, pharyugeal teeth. (After Owen.) 514), and thus forms a kind of anvil upon which the bruising pharyngeal teeth play, and thus crush and triturate whatever food passes into the oesophagus. In the Scari, which have to feed upon the numerous corallines that clothe the rocks at the bottom of the ocean, the dental apparatus given to protect their jaws from injury while biting such hard substances is very remarkable. The
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Teeth of the Tench. a, roof of the mouth ; b, the oesophagus ; c, dental projection from basilarbone j d, d, pharyugeal teeth. (After Owen.) 514), and thus forms a kind of anvil upon which the bruising pharyngeal teeth play, and thus crush and triturate whatever food passes into the oesophagus. In the Scari, which have to feed upon the numerous corallines that clothe the rocks at the bottom of the ocean, the dental apparatus given to protect their jaws from injury while biting such hard substances is very remarkable. These Fishes have their jaws, which resemble the beak of a parrot (whence they receive their usual appellation " Parrot-fishes,") covered externally with a kind of pavement of teeth answering the same purpose as the horny investment of the mandibles of the bird. The teeth that form this pavement are perpetually in progress of developement towards the base of the jaw, whence they advance forwards, when completed, to replace those which become Fig. 516. In the Cyprinidtf, or Carp-ge- nus, the bones composing the superior and inferior maxillae are completely edentulous, but to make up for this deficiency the pharyngeal bones are armed with a remarkably powerful dental ap- paratus of very singular character. Each of the inferior pharyngeal bones, which are exceedingly strong and form a kind of osseous framework at the commencement of the oesophagus, supports four or five large teeth of great strength. These are opposed to a single dental piece of stony hardness and Section of the jaw of the Parrot-fish, shewing the progress of laminated structure, which is fixed c, teeth still enclosed in the jaw ; I, do. with their extremities ... - . _ - \ff v^v,LUi Ob&AI ^li^lVFO^Vi 111 LrUtJ 1» w» . ' , «*' upon a dilated projection from the protruded so as to form an external pavement. (After Owen.) basilar bone of the cranium (Jig. worn away in front by the constant
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