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Excerpt from Johnsonia, 1954-1959, Vol. 3: Numbers 33-39 The average length of life for any one Species of pholad, the breeding age or the num ber of eggs produced, and the duration of the free-swimming larval life are questions still unanswered. Additional notes on life history and habits, if known, are included in Remarks under the individual Species. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.