A description of the teeth of the Anarrhichas lupus Linnaei, and of those of the Chaetodon nigricans of the same author : to which is added, an attempt to prove that the teeth of cartilaginous fishes are perpetually renewed / by William Andre ; communicated by Sir Joseph Banks.

  • André, William, 1743-1807.
Date:
1784
Catalogue details

Licence: Public Domain Mark

Credit: A description of the teeth of the Anarrhichas lupus Linnaei, and of those of the Chaetodon nigricans of the same author : to which is added, an attempt to prove that the teeth of cartilaginous fishes are perpetually renewed / by William Andre ; communicated by Sir Joseph Banks. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    articular furface, for their connexion with a fimilar furface on the pofterior extremities of the lower jaw ; and on their ante- rior ends there are two rows of teeth. The external row con- hits of three or four lharp or conical teeth; and the internal row of four or five blunt and rather flat ones. Thefe bones are conne&ed to the palate and bones of the nofe by loofe but Ibrong ligaments. The third bone of the upper jaw, which may be called the anterior or nafal portion, is of a triangular form, connected above to the bones of the nofe, and ending below in a flat fur- face, thick-fet with lharp conical teeth. The external teeth, about four in number, are large and flrrong, and bend a little inwards ; but the internal ones are fmall, and nearly fraight, of which we may reckon about ten. This bone is connected above (as I have before obferved) to the bones of the nole; between which a complete joint is formed, of that kind called by anatomifts gingiymus, that is, where the proje&ing parts of one bone are received by cor- refponding cavities in the other. Like other articulations, it is furnilhed with a capfular ligament, and no doubt an apparatus for the fecretion of fynovia. Although a joint exifts between this bone, and thofe of the nofe, yet no mufcles are provided for its motion, which depends entirely upon the refinance made by thofe hard bodies which the animal takes into its mouth. The lower jaw (D) confifts of two bones, united at their fore-parts by a ftrong ligament, which allows of fome motion. On their anterior extremities are placed fix large and as many fmall lharp and conical teeth ; the large teeth are placed exter- nally, and their points are bent a little inwards; while the fmall ones, which Hand within them, are nearly llraight. Behind thefe are two or three rows of grinder teeth. The A 2 external