342 



THE WONDERS OF GEOLOGY. 



Lect. IV. 



Several dorsal spines of a Shark allied to the Dog-fish 

 (Acanthias) of our coasts, were found in the same quarries.* 

 Vertebrae, and other remains of sharks, have been obtained 



4 5 



Lign. 70. — Teeth of sharks; from the chalk near L:.wes. 



Fig. 1. Galeus pristodontus. 

 3. Notidanus microdon. 

 5. Ptychodus polygurus. 



2. Lamna crassidens. 

 4. Ptychodus polygurus. 

 6. Lamna elegans. 



in considerable numbers from the chalk of the south-east of 

 England. 



The mandible, or anterior part of the maxillary bone of 

 a fish belonging to a very remarkable family, of which the 

 Chim&ra is the only living type,j* was found in the chalk 

 marl at Hamsey, near Lewes, many years since, associated 

 with turrilites, hamites, &c. and subsequently examples of 



* Medals of Creation, vol. ii. p. 609. 



f Ibid. p. 619. 



