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Preface To The Fourteenth Edition The dimensions of biology are fast increasing with more and more emphasis on cell biology, molecular biology, genetics, biochemistry, physiology, electron microscopy, biotechnology and development biology embryology , etc. Many Indian Universities have already introduced some topics of these disciplines in their under-graduate syllabi. The importance of basic zoology, however, cannot be ignored most teachers and researchers rightly feel the need for a strong base in general zoology as a prerequisite for all fields of specialisations. Jordan s Chordate Zoology has served a great deal towards the fulfilment of this aim. It has been a national best seller for more than four decades. It was, therefore, found necessary to bring out the same book in more useful and enlarged form. The book has been thoroughly revised and enlarged in this edition. I have retained all that was judged good and useful in the previous edition. However, a number of changes have been made in this edition. Subject matter have been revised and updated in the light of recent researches and new topics have been added at appropriate places keeping in view the changes in the syllabi of various Indian Universities. New chapters and topics which have been added in the present edition are i Pisces Fishes Labeo rohita Type study Comparison of Chondrichthyes and Osteichthyes Dipnoi Fin System Scales Air-bladder or Swim-bladder Accessary respiratory organs Parental care Migration and Economic importance. ii Amphibia Parental care Neoteny and Paedogenesis Origin and Ancestry. iii Reptilia Calotes versicolar Type study Snakes General account Reptilia General account. iv Aves Common Flightless birds Ratitae Types of beaks and feet or claws Types of skull palate Archaeopteryx and its significance Birds are glorified reptiles Birds as a flying machine Aerial or flight adaptations Migration and Economic importance. v Mammalia Prototheria Order Monotremata Metatheria Dentition Aquatic mammals and adaptations Flying Volant mammals and adaptations Adaptive radiations Adaptive convergence Origin and Ancestry and Economic importance. vi Vertebrate Embryology and Comparative Anatomy Several new topics have been added. vii Wildlife in India. viii Glossary. In addition to this, general topics, which are usually asked in the examinations, have been thoroughly revised and some new topics have also been added in all the classes of chordates. In the last few years, most of the universities have introduced long answer type, short answer type, very short answer type and multiple choice type objective type questions in the examination papers. To cater this requirement, various types of questions have been added at the end of each chapter. The examination oriented text is written for all students, even for those who do not have a good background in the subject. The language is simple, explanations are clear, and presentation is very systematic. To improve scientific accuracy, about 706 well-labelled diagrams have been included at appropriate
places. Important words are given in bold face and definitions in italics. Subject matter is error free. Notwithstanding several Indian books on Chordate Zoology or Vertebrate Zoology, I hope the present edition of Chordate Zoology shall serve the purpose of learned teachers and students. I am thankful to the Management Team and the Editorial Department of S. Chand Company Ltd., for all help and support in the publication of this book. I like to express my thanks to the esteemed teachers for sending their valuable suggestions and opinions and shall hope to receive the same in future.