226 UPPER, OR FLINTY CHALK. 



Moelsbrock, a 6te trouvee, fossile, une serie de vertebres jointes ert^ 

 semble, au nombre de S8, et formant un tout de cinq pieds, qui ne diminue 

 dans cette longueur que de trois lignes ou plus. II n'y a aucune trace 

 d'apophyses. M. Burtin regarde cet ichthyolite comme provenant d'un 

 serpent de mer; et par-la il est probable qu'il entend parler du congi'e; 

 mais il se pourroit plutot qu'il provint d'une grande esp^ce de squale, 

 qu'il est a peu pres impossible de specifier." 

 Locality. Upper chalk, near Lewes. 



100. Teeth of Squalus cornubicus. Tab. xxxii. fig. 1. 



The teeth of sharks are so numerously distributed throughout almost 

 every deposit of the secondary formations, that there is scarcely an 

 oryctological writer, who has not made mention of them. They are the 

 glossopetra, ornithoglossa, &c. of the earlier authors, and have been de- 

 scribed by Woodward, Lhwyd, Knorr, Scilla, &c. 



The present species has sharp entire edges, and two sharp pointed 

 lateral processes. The specimens are generally straight, slender, taper- 

 ing, and sometimes slightly curved ; the cartilaginous base is deeply arched, 

 and has an obtuse tubercle on the centre of the outer surface. The dif- 

 ference observable in their forms, is probably owing either to the age of the 

 individual, or to the situation the teeth respectively occupied in the jaw 

 of the recent animal ; the anterior being longer, and more slender, than 

 the posterior ones. 



Localities. Upper chalk near Lewes, Brighton, Steyning, &c. 



101. Teeth of the Squalus jnustelus*. Tab. xxxii. figs. % 3, 5, 6, 9, 11. 

 These teeth are triangular, nearly straight, and flat, with entire cutting 



edges; and furnished with two small acuminated lateral processes. The 

 base of the tooth is nearly straight, and the cartilage but slightly arched. 



The specimens figured are from the Upper and Lower chalk ; in fig. 1 1 

 the lateral processes are destroyed. 



* A spfecimen of the recent animal, about six feet long, was caught a few years since off 

 Newhaven ; the head came into my possession, and enabled me to compare the fossil with the 

 recent teeth ; the correspondence between them was most complete, and left no doubt of their 

 having belonged to the same species of Squal.us. 



