THE most recent number of the Proceedings of the Malacological Society of London (25, Pt. 2) is entirely occupied by an important paper by Dr. Kathleen M. White on “The Pericardial Cavity and Pericardial Gland of the Lamellibranchia”. Present and future workers on the morphology of the Lamellibranchs will be grateful for this paper which, without unnecessary verbosity, summarizes existing knowledge on the subject and adds materially to it. A wide range of material was examined, some eighty species from seventy-one genera and forty-six families. Excellent figures are given of conditions in many species.
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