. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Mi/xine. (Miiller.) tongue. The Tench (fig. 514. Vol. III. p. 979. art. PISCKS)* has a single grinding tooth on the occiput (r), opposed to two denti- gerous pharyngeal jaws below (dd). In the Lepidosiren a single maxillary dental plate (fig. 560., a) is opposed to a single mandibular Fig. Lepidosiren. one (b), and there are two small denticles on the nasal bone (c). In the extinct Sharks with crushing teeth, called Ceratodus and Cte- nodus, the jaws were armed with four teeth, two above and two In the Chmc
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Mi/xine. (Miiller.) tongue. The Tench (fig. 514. Vol. III. p. 979. art. PISCKS)* has a single grinding tooth on the occiput (r), opposed to two denti- gerous pharyngeal jaws below (dd). In the Lepidosiren a single maxillary dental plate (fig. 560., a) is opposed to a single mandibular Fig. Lepidosiren. one (b), and there are two small denticles on the nasal bone (c). In the extinct Sharks with crushing teeth, called Ceratodus and Cte- nodus, the jaws were armed with four teeth, two above and two In the ChmceraB, two mandibular teeth are opposed to four maxillary From this low point the number in different fishes is progressively multiplied until, in the Pike, the Siluroids (fig. 561.), and many other fishes, the mouth becomes crowded with countless teeth. With respect to form, I may first observe, that as organised beings withdraw themselves more and more, in their ascent in the scale of life, from the influence of the general polarising forces, so their parts progressively deviate from geometrical figures: it is only, therefore, in the lowest vertebrated class that we find teeth in the form of perfect cubes, and of prisms or plates with three sides (Myletcs), four sides (Scarus), five or six sides, Mylio- bates (fig. 562.). The cone is the most com- mon form in fishes : such teeth may be slender, sharp-pointed, and so minute, numerous, and closely aggregated, as to resemble the plush or pHe of velvet; these are called " villifonn teeth" (denies villiformes, dents en velours§)• all the teeth of the Perch are of this kind : * And Odontography, pi. 57. fq. 5. t See Odontography, pi. 22, fas. 2. 6, 7. j Ib., pi. 28, figs. 1, 2. 4. 6. § The French terms are those used by Cuvier and Valenciennes in their great " Histoire des Pois- sons," Please note that these images are extracted from scanned page images that may have been digitally enhanced fo
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