The indicated Parts (excepting the first and last) are to be published at whatever time each is ready. All may be assembled ultimately in bound volumes. In the following list, already published Parts are marked with a double asterisk (U) and those in press or nearing readiness for press are marked with a single asterisk (*). Each is cloth bound with title in gold on the cover. Copies are available on orders sent to the Geological Society of America at 419 West 117th Street, New York 27, N.Y., at prices quoted, which very incompletely cover costs of producing and distributing them but on receipt of payment the Society will ship copies without additional charge to any address in the world.The list of contributing authors is subject to change.(A)-INTRODUCTION. M-MoLLUSCA 5 (dibranchiate cephalo-B-PROTISTA 1 (chrysomonads, cocco-pods). lithophorids, diatoms, etc.).N-MoLLUscA 6 (pelecypods). C-PROTISTA 2 (foraminifers). **O-ARTHROPODA 1 (trilobitomorphs) **D-PROTISTA 3 (radiolarians, tintin-(xix+560 p., 2880 figs.). $10.50. nines) (xii+195 p., 1050 figs.). **P-ARTHROPODA 2 (chelicerates, pycno-$3.00. gonids) (xvii + 181 p., 565 figs.
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