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.
ABSTRACT. A new troglobitic sigillid genus, Kasella, is found in the submarine caves of the Ryukyu Islands. Sigillids are primitive podocopid ostracods having ancient characters such as unequal valves and many small adductor muscle scars. Kasella is possibly derived from the sigillid Cardobairdia, a deep-sea muddy bottom inhabitant, or its relatives. Submarine caves are characterized as both 'safe places', where biological factors such as competition and predation are reduced, and as 'crypts', representing dark and oligotrophic environments. It is likely that Kasella has successfully colonized hard substrates in caves, particularly exploiting the crevices on cave walls and ceilings. Kasella may have adapted to this cryptic habitat in response to strong cytheroidean competition and predation by, for example, gastropods that do not survive well in dark and oligotrophic submarine caves. In adapting to an oligotrophic cave environment, Kasella has undergone significant divergence in carapace morphology, possibly accompanying functional and behavioural changes.
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