PLATE XLV. 



Figs. 1 — 6. OsTREA ACUTiROSTRis, i\W«., p. 471 J 1, a young perfect specimen ; 2, 2«, lower 



valve ; 3, 3a, upper valve ; 4, the same and a lower valve in their natural 

 position ; 5, a larger upper valve ; the surface about the beak rather corroded ; 



6, a ilat, but very thick, lower valve ; all from near Arnaloor, Arrialoor group. 



Figs. 7 — la. Gryph^a VESicULARis, Lam., p. 465; specimens of various shapes and sizes; 



7, 9, 10, 12 represent lower, or larger, valves; 8 and 11 are upper, or smaller, 

 valves ; all from the coarse sandy beds at Comarapolliam, Arrialoor group. 



Figs. 13-14. Gryph^a Aerialoorensis, Stol., p. 464 ; a young and a more fully grown speci- 



men, both perfect; Arrialoor, Arrialoor group. 



