. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 412 ANATOMY OF VERTEBRATES. tissue. But the surface of the prominent tongue is generally callous, and either smooth and devoid of papilhis, or, if the repre- 277. Vertical scrtidu of iinaitli, Lniiijn-ey. v. sentatives of these be jiresent, they are calcifiod and the tongue is beset with teeth. It, then, seizes and ]iasses the food on to the gullet; but the supporting arch of the tongue, fig. 85, .38-40, works chiefly for respiratory purposes. In the Lamprey, the tongue, fig. 277, d, is more exclusively related to the di
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 412 ANATOMY OF VERTEBRATES. tissue. But the surface of the prominent tongue is generally callous, and either smooth and devoid of papilhis, or, if the repre- 277. Vertical scrtidu of iinaitli, Lniiijn-ey. v. sentatives of these be jiresent, they are calcifiod and the tongue is beset with teeth. It, then, seizes and ]iasses the food on to the gullet; but the supporting arch of the tongue, fig. 85, .38-40, works chiefly for respiratory purposes. In the Lamprey, the tongue, fig. 277, d, is more exclusively related to the digestive function than in higher Fishes: it can be protruded and retracted, like a piston, when the sucker is attached to the prey ; and it is armed by small serrate teeth for tearing the flesh. In a few Fishes the integu- ment of the palate presents that degree of vascularity and supply of nerves which indicates some selective sense, analogous to taste. In the Cyprinoids tlie palate is cushioned with a thick soft vascular substance, exuding mucus by numerous minute pores, but more remarkable for its irritable erectile or contractile property :' if any part of this Ijc pricked in a live Carp, the part rises immediately into a cone, which slowly subsides ; this peculiar tissue is richly supplied by branches of the glosso-pharyngeal nerves: it may assist in the rcrpiisitc movements of the vegetable food, as well as add to it an animalising and solvent mucus, whilst it is undergoing mastication by the ])haryngeal teeth. In the Gymnotus there are four scries of Ijranehed fleshy processes in the mouth, one upon the dorsum of the tongue, a second depending from the palate, and one along each side of the mouth. â The only representatives of a salivary system in Fishes are the mucous follicles that communicate with tlic mouth.^ The chief of 2 Tho reddish vascular body, discovered by Kelzius (cxxi.) between the basi-. Please note that these images are extracted from scanned page images
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