Placuna

There is the frail, flat, translucent “window-shell” (Placuna), the valves of which fit so closely that the poor little inhabitant is squeezed to a wafer, a film, a fragment of muscle.

Tropic Days 2003

There is the frail, flat, translucent "window-shell" (Placuna), the valves of which fit so closely that the poor little inhabitant is squeezed to a wafer, a film, a fragment of muscle.

Tropic Days 1887

The Bay of Tamblegam, connected with the magnificent harbour of Trincomalie, is the seat of another pearl fishery, and the shell which produces them is the thin transparent oyster (_Placuna placenta_). whose clear white shells are used, in China and elsewhere, as a substitute for window glass.

Sketches of the Natural History of Ceylon James Emerson Tennent 1836

So prolific are the mollusca of the _Placuna_, that the quantity of shells taken by the licensed renter in the three years prior to 1858, could not have been less than eighteen millions. [

Sketches of the Natural History of Ceylon James Emerson Tennent 1836