. On the anatomy of vertebrates [electronic resource] . e orifice of which is also surrounded by vibratilecilia. There is no tongue in this rudimentary fish : that organ isoften absent or very small in the typical members of the Class;its basis, the glossohyal, when it projects at all into the mouth, asin fig. 276, c, is rarely covered by integuments so organised as tosuggest their being endowed with the sense of taste. In Anguil-lidce the lingual membrane is raised by some adipose and muscular 1 Mr. Couch narrates an instance of a large Cod, in good condition, taken on aline at Polperro, Corn
. On the anatomy of vertebrates [electronic resource] . e orifice of which is also surrounded by vibratilecilia. There is no tongue in this rudimentary fish : that organ isoften absent or very small in the typical members of the Class;its basis, the glossohyal, when it projects at all into the mouth, asin fig. 276, c, is rarely covered by integuments so organised as tosuggest their being endowed with the sense of taste. In Anguil-lidce the lingual membrane is raised by some adipose and muscular 1 Mr. Couch narrates an instance of a large Cod, in good condition, taken on aline at Polperro, Cornwall, in which the orbits contained no eyeballs, but were coveredwith an opake reticulated skin. So that he felt convinced that * eyes never hadexisted ; yet the fish was in good condition, and must have depended on the tactileorgans about the mouth for the discovery of its food, xcvin. p. 72. 412 ANATOMY OF VERTEBRATES. tissue. But the surface of the prominent tongue is generallycallous, and either smooth and devoid of papilla?, or, if the repre- 277. Vertical section of mouth, Lamprey, v. sentatives of these be present, they are calcified and the tongue isbeset with teeth. It, then, seizes and passes the food on to thegullet; but the supporting arch of the tongue, fig. 85, 38-40, workschiefly for respiratory purposes. In the Lamprey, the tongue, , d, is more exclusively related to the digestive function thanin higher Fishes: it can be protruded and retracted, like a piston,when the sucker is attached to the prey ; and it is armed by smallserrate teeth for tearing the flesh. In a few Fishes the integu-ment of the palate presents that degree of vascularity and supplyof nerves which indicates some selective sense, analogous to the Cyprinoids the palate is cushioned with a thick softvascular substance, exuding mucus by numerous minute pores,but more remarkable for its irritable erectile or contractileproperty:1 if any part of this be pricked in a live Carp, the pa
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