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Synopsis The present title "Lower Chordata" has been carefully designed and edited to meet the long felt needs of undergraduate students and their teachers. This title has been written to approaches the morphology, anatomy, physiology and development of the selected type in a very simple and lucid style. According to the scheme of treatment the important animal types of each phylum have been dealt with first, and efforts have been made to present their elaborate and up-to-date account. In the description of animal types special emphasis has been laid on the functioning of organs. General characters and classification and brief description of other important types of the phylum have also been dealt with complete authentic and up-to-date account. Separate chapters on topics of significance and general interest pertaining to the phylum have been also added to make the treatment more elaborate. The method of presentation is very clear and systematic, which can be easily followed by an educated layman. It is an adequate text for all requirements in this area for the undergraduate students. It is our earnest hope that this book will be of great value to all our students.