46 STRATA OF TILGATE FOREST. 



sharpness of outline, with their natural polish, heightened and improved 

 by mineralization. Their colour is a dark chocolate, inclining to black, 

 apparently produced by an impregnation with oxide of iron : they are ex- 

 ceeding brittle, and have their cavities filled with the substance in which 

 they are imbedded. 



1 3. A triangular tooth, of a species of Squalus or shark, resembhng in 

 form the specimen represented, fig. 9. pi. xix. vol. iii. Org. Eem. but 

 much smaller : it occurs also at Stonesfield, near Oxford. 



14. A triangular tooth, with two lateral processes, the surface longi- 

 tudinally striated — length 0-2 inch. Mr, Parkinson has figured a similar 

 fossil from the Old Passage, Gloucestershire, but does not offer any opi- 

 nion as to what animal it originally belonged. 



15. Molar teeth of the Anarhicas lupus*. These are of a serai-or- 

 bicular form, sometimes slightly acuminated, from the size of a millet 

 seed to 0*5 or 0-6 inch in diameter : they possess a beautiful pohsh, and 

 are called " fishes eyes" by the workmen, I have compared these fossils 

 with the molar teeth of the recent A. lupus or sea wolf, and could not per- 

 ceive the slightest difference either in their form or structure. They are 

 frequently worn nearly flat, probably from the mastication of hard sub- 

 stances, as the recent fish preys on crustaceous and testaceous animals. 

 In one specimen twenty of these bodies are attached to a small block of 

 Hmestone. They are very abundant in the alluvial aggregate, and are 

 found in the Stonesfield slate. 



16. Scales of a lozenge shape, an inch long, and three-quarters of an 

 inch wide, having bifurcated processes of attachment. 



These scales are very thick, and of a glossy black colour ; the process of 

 attachment is of a pale brown, and of a bony, or perhaps, cartilaginous 

 structure. Although in conformity with the opinion of others, I have 

 been induced to consider these fossils as belonging to an unknown fish ; 

 yet I entertain some doubts if they may not, with greater propriety, be 

 referred to an animal of the lizard tribe. 



* Vide ParJcinson, Org. Rem. vol. 3. six. fig. 6, 7. Lhipid, iig. 1382. 1525. Scilla, Tav. 2. 

 Faujas. Hist. St. Pierre, tab. xix. 



