DESCRIPTION OF PLATE VI. 



POSSIL SHELLS FROM THE WEALDEN DEPOSITS. 



Fig. 1. — Unio Valdensh ; from the fossil forest at the hase of the cliff at 

 Brook-point. A young shell ; the figure is two-thirds the 

 natural size in linear dimensions. The uppermost figure gives 

 the inner view of the same shell, to show the hinge and mus- 

 cular imprints. 



2. — Taludina elongata, in hard clay, from near Brook-point ; large 

 slahs of laminated clay covered with this species, associated 

 with myriads of C\"prides, are continually laid bare hy the inroads 

 of the sea. 



3. — Pahidina Jfi/viorum ; a portion of a weathered slab of limestone, 

 from Compton Bay. 



4. — Cyrenu media; in a piece of bluish-grey limestone, composed of 

 thin bivalves ; from Compton Bay. 



5. — Potamides carbonarius ; a slab of limestone formed of this 

 species of fresh-water shell ; from Compton Bay. 



I have found the Unio Yaldensn only in the cliffs, along Brook Bay ; 

 the other fresh-water shells are ecrually abundant in Sandown Bay. 

 The shelly limestones of the "Wealden are often used for paving, in the 

 towns and villages of the Island. 



