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Are very numerous and marked. They are observed, particularly, at the upper surface of the organ, and are distinguished into-1. The Lenticular papillae, Papillae mucosae seu maximae seu capitatae seu vallatae seu circumvallatae seu truncatae seu calyciformes. They are arranged at the base of the tongue in two oblique lines having the shape of the letter V; and united angularly at the foramen caecum. They have, in general, an ovoid or spherical shape, and have seemed to be mucous follicles similar to those of the palate, lips, &c. 2. The Fungiform or Fungoid Papillae, Papillae mediae seu semilenticulares, are of indeterminate number, but always more numerous than the preceding. They are irregularly disseminated near the edges and the point of the tongue; have a rounded and flattened head, supported by a short and narrow footstalk. Their tint is whitish. 3. The Conical, Conoidal or Pyramidal papillae, P. minimae seu villosae, are the most numerous of all. Their arrangement is more regular in the forepart of the tongue than behind. They resemble small cones; the base being towards the tongue and the apex free. The anterior are very small, and have been called Filiform papillae. They appear to be produced by the terminations of the filaments of the lingual nerve, and are surrounded by an evident vascular network.