178 



geoloGy of the isle of wight. 



Fig. 63. 



Pfltamocypris 

 Brodiei, J. & S. 



To this list Dr. H. Woodward adds two new Crustacea : a 

 Phyllopod, Branchipodites i^ectensis, and an Isopod, Eospharoma 

 fiuviatile. A second species of Isopod, Eosph(2roma Smithii, was 

 discovered by Mr. Smith in a " fine yellow 

 marl or pipe-clay, full of rootlets of aquatic 

 plants " somewhat higher in the series. 

 Ostracoda also occur, and in the last volume 

 of the Palseontographical Society's mono- 

 graphs, Messrs. Jones and Sherborn de- 

 scribe a new species of Potamocypris 

 (Fig. 63). 



The determinable plant-remains in the 

 Insect Bed, though not abundant, are also 

 interesting, but until Mr. Gardner has 

 finished his monograph on the Oligocene 

 «• h. flora not much can be said about them. 



a. Right valve (slightly More to the west, at Thorness Point, 

 mTSn^''* ^^"^ posterior Forbes measured a good section of the 



b. Edge^view. Magnified i^i^^dle beds of the marls, exhibiting the 

 20 diam. following succcssion in descendino; order : — 



Green clays, with plentiful specimens of Melanopsis carinafa, 

 and, less abundantly, Paludina lenta, Melania turritissima, 

 and Cyrena obovata - - . . . 



Band of comminuted Melania .... 



Dark-green shaly marls, with ferruginous concretions, and 

 numerous specimens of Melania muricata and Melanopsis 

 carinata, a belt of which shell forms the base of this bed - 



Green marls, with Paludina lenta - - . . 



Pale-yellow stony band, composed of comminuted shells, and 

 becoming a limestone. Broken Cyrena and Melania muri- 

 cata form the mass of it - 



Green clays, with lines of broken Melania muricata • 



Band of comminuted Melania muricata ... 



Green marly stone, with a well-preserved band of Melania 

 muricata -..--.- 



Band of comminuted Cyrence .... 



Grey septarian stone band, capped by a thin layer of greenish 

 stone, with fucoidal markings .... 



Greenish marls, with bands of finely preserved Cyrena obovata, 

 very abundant, patches of Melania muricata, and scattered 

 shells of Paludina lenta ..... 



Band of septarian stone ..... 



Green clays, full of Melania muricata, constituting the last 

 bed exposed upon the shore. 



Ft. In. 



6 

 2 



2 2 

 2 3 



1 2 



2i 



2 



44 



4A 



5 



2 6 

 2 



In this neighbourhood the thickness of the Bembridge Marls 

 has apparently decreased to about 90 feet, but the Hamstead 

 Beds are so overgrown that it is difficult to obtain exact measure- 

 ments. 



Crossing the Newtown Eiver, we find, at Hamstead, the only 

 locality where a section of the entire thickness of the Bembrido-e 

 Marls is displayed. Here the whole of the beds which compose 



