Synopsis Annelida consists of two words one is Latin annulus meaning a ring and a Greek eidos meaning form. Annelids are typical animals that burrow or crowl upon the bottom in the ocean or in fresh water.And Introduction to Annelida 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. The approach to the discussion of all the types is very simple so as to impact to the students the clear and vivid understanding. 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 another 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.Students and teachers in the field will find this book of utmost use.