. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. Jaws and teeth iMijUohdcs). between the villiform and raduliform types. Setiform teeth are common in the Fishes thence called Clifetodonts;' in the genus Citharina they bifurcate at their free extremities ; in the genus Platax they end there in three di- verging points, and the cone here merges into the long and slender cylinder, fig. 253. Sometimes the cone is compressed into a trenchant blade : and this may be pointed and recurved, as in the Murana ; or barbed, as in Tricldurus, and some other Scomberoids; or it may be
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. Jaws and teeth iMijUohdcs). between the villiform and raduliform types. Setiform teeth are common in the Fishes thence called Clifetodonts;' in the genus Citharina they bifurcate at their free extremities ; in the genus Platax they end there in three di- verging points, and the cone here merges into the long and slender cylinder, fig. 253. Sometimes the cone is compressed into a trenchant blade : and this may be pointed and recurved, as in the Murana ; or barbed, as in Tricldurus, and some other Scomberoids; or it may be bent upon itself, like a tenterhook, as in the fishes thence called Goniodouts.^ In the Bonito may be perceived a progressive thickening of the base of 2»'^ the conical teeth: and this beinor combined in other predatory fishes with in- creased size and recurved direction, they then resem- ble the laniary or canine teeth of carnivorous quad- rupeds, as we see in the large teeth of the Pike, in the Lophius, fig. 260, and in certain sharks, fig. 263. The anterior diverging ,j,jj ^ grajipling teeth of the wolf- fish form stronger cones ; blunting, flattening, and expansion of the apex, observable in different fishes, the cone gradually changes to the thick and short cylinder, such as is seen in the back teeth of the wolf-fish, and in similar grind- ing and crushing teeth in other genera, whether feeders on sea-weeds or on crusta- ceous and testaceous animals. The grind- ing surface of these short cylindrical teeth may be convex, as in the Sheep's-head fish {Sarffus); or flattened, as in the pharyngeal teeth of the A\'rasse {TMbnis, fig. 25-4). Sometimes tlie hemispheric teeth arc so numerous, and spread over so broad a ' Xahri, a bristle ; uSois, a tooth. = Voivta. nii niiglc ; nSovs, n and by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may no
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1860
