Generally, these are referred to as individual "luncheon" plates in the marketplace. ...
Generally, these are referred to as individual "luncheon" plates in the marketplace. However they are part of Wedgwood's extensive "Wreathed Shell" dessert service. Here they are offered in Wedgwood's whiteware body with a very pale pink glaze -- slightly more intense at the edges. They are part of an extensive catalog of dessert pieces including a large footed shell centerpiece (with stand), sauce tureens and serving dishes, all based on actual shell shapes. In addition to the plates, we have occasionally seen individual sauce dishes, butter pats and even an oyster shell shape.
One caution here -- beware, these may be considered the gateway drug to much more extensive collecting.