256 



described, or to animals specifically distinct. The circumstance, how- 

 ever, of the vast difference in size, leads me to believe the latter to be the 

 case. Plate XIX. Fig. 2 and 9, represent some of the smaller specimens 

 of triangular teeth. 



The straight conical glossopetrae, have been supposed to resemble 

 the tongue or beak of a raven, and have been named Ornithoglossa and 

 Grazirrhinchi. These appear to have belonged to fish approximating very 

 nearly to those to which the preceding teeth have belonged. Scilla, who 

 carefullf examined the fossils of this description, supposed these fossil 

 teeth to have belonged to that species of shark which the Messinese have 

 named Stampella, (Squalus zygena, Linn.) the balance-fish, of which fish 

 he gives a correct figure, as well as three figures of the accordant fossil 

 teeth, so frequently found at Malta *. A representation of a fossil tooth 

 from Malta, of this species, is given Plate XIX. Fig. 2. 



The fossil tooth from the Kentish chalk- pits, Plate XIX. Fig. 3, very 

 much accords with the description of the teeth of the Squalus galeus, 

 Linn. Its length hardly exceeds its width ; and its point is so much 

 inclined to one side, as to form a notch on that side. The edges are very 

 finely serrated. The teeth of the Squalas miistelus, according to M. Cu- 

 vier, agree in form w ith the preceding, but are scarcely at all jagged on 

 their internal edge. It seems to be to this species that the teeth named 

 Acanthiodontes, and figured by Lhwydd, No. 1417, may be referred. 



The fossil tooth, Plate XIX. Fig. 5, rising into a sharp simple point, 

 with a small point on each side, projecting immediately from the root, 

 resembles, in these characters, the teeth of the Squalus dnereus. All the 

 teeth of the Squalus stdlaris are also long, and pointed with a small point 

 on each side, at the base, like the last figured tooth. In the Squalus 

 nasus are similar teeth, but not so numerous as in S. stellaris. 



Triangular teeth, with three points, are the Glossopetrte tricuspida faves* 

 tridentul<R> Luidii. Teeth of this figure are found in the Isle of Shepey, and 



* De Corp. Marin. Lap. Tab. xxvin. Fig. n. in. 



