PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES FOURTH SERIES Vol. XXX, No. 9, pp. 175-206, figs. 1-4. July 1, 1964 A QUANTITATIVE ANALYSIS OF MOLLUSCAN COLLECTIONS FROM ISLA ESPIRITU SANTO, BAJA CALIFORNIA, MEXICO BY A. MYRA KEEN Stanford University, California On a reconnaissance trip to Espiritu Santo Island, made November 1, 1959, we noticed, as we waded ashore at Candelero Bay, an unusual concen-tration of fine drift shells. About three pounds of the material was brought back for sorting. From this, plus the larger shells picked up during a moder-ately low tide that day, there resulted a total count of nearly 200 molluscan species, which at the time seemed indicative of a very rich fauna offshore. A second trip to the area in August, 1960, yielded living specimens of Berthelinia, a bivalved gastropod (Keen and Smith, 1961), as well as several other obviously new species, adding to the conviction that more intensive work should be done here. A longer survey was undertaken in December, 1960, under the auspices of the California Academy of Sciences and the Belvedere Scientific Fund. Fa-cilities were provided both for shore collecting and for dredging. The party consisted of Dr. Robert C. Miller of the California Academy, Dr. and Mrs. Ira Wiggins of Stanford University, Drs. Antonio Garcia Cubas and Alejandro Vil-
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