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Synopsis "Members of the phylum Mollusca are among the most conspicuous invertebrates and include such familiar forms as clams, oysters, squids, octopods and snails. In abundance of species, molluscs comprise the largest invertebrate phylum aside from the Arthropoda. Over1,00,000 living species have been described. In addition, some 35,000 fossil species are known. An introduction to Mollusca is the second revised and enlarged edition of the book. It has been designed to approach the morphology, anatomy, physiology and development of selected type in a simple and lucid style. According to the scheme of treatment the important animal types of the phylum have been dealt with first, and efforts have been made to present their elaborate and uptodate account. General characters and classification and brief description of other important types of the phylum have also been dealt with complete, authentic and uptodate account. Further separate chapters on topics of significance and general interest pertaining to the phylum have also been added to make the treatment more elaborate."