324 THE GEOLOGIST. 



in his first gathering, are the readily distinguishable Plicatula pecte- 

 Twides and Ostrea Bauliniana. 



He will also meet with one or two other species of PHcatula and 

 Oysters. 



Lign. 32. — Lima parallela. 



Lign. 33. — Area earinata. 



The species of univalve shells of the Ganlt are few, although of 

 two or three species the individuals are numerically abundant. Veiy 



Lign. d^.—Tiirritella vibrayeana. 



rarely a delicate Turritella (T. Vibrayeana, or T. Hugardiaua) may 

 be seen on the face of a newly cleaved block, and now and then a 



