Habit and Shell-shape in the Portuguese Oyster, Ostrea angulata

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IT is known that the form of the shell of Portuguese oysters (O. angulata) living on the shore is different from that of individuals living permanently below tide-marks1. In the latter the shell is relatively very broad, in the former long and narrow, almost in the shape of a shoe-horn with the hinge at the narrow end. No explanation of this difference in shape could formerly be offered, but in a recent inspection of extensive inter-tidal beds of Portuguese oysters in the River Blackwater, to which I was courteously invited by Mr. Louis French, a probable explanation of the prevailing elongate-shaped shell suggested itself.

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  1. 1

    J. H. Orton and P. R. Awati, J. Mar. Biol. Assoc., 14, 227 (1926).

  2. 2

    Dean Bashford, Bull. U.S.F.C., 10, 367, 1890 (1892).

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