Through the kindness of Mr. Balfour I was enabled to study the structure of the eye of one species of this genus of Lamellibranchs. The margin of the mantle of several specimens was sent to him from the zoological station at Naples, treated with osmic acid and absolute alcohol, and with absolute alcohol alone. I was unable to determine the species to which the specimens belong.

1

This Journal, Oct., 1880.

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