CONTENTS 



Author's Preface to the English Edition 



From the Author's Preface to the Russian Edition vii 



Translator's Preface ix 



Part I: General Account 



Chapter Page 



1. Introduction 3 



2. External Morphology and the General Body Plan 7 



3. The Integument and Associated Structures 32 



4. Musculature and Papillae 42 



5. Nervous System and Sense Organs 50 



6. The Coelom and Its Derivatives — The Excretory System 59 



7. The Blood-Vascular System 71 



8. The Tentacular Apparatus and External Digestion 79 



9. The Reproductive System 90 



10. Embryological Development 103 



11. The Tube 120 



12. Ecology 123 



13. Geographical Distribution 127 



14. Systematic Position of the Pogonophora and 



Evolution within the Class 132 



15. Methods of Investigation 145 



Part П: Systematic Account 



Class POGONOPHORA JOHANSSON, 1937 151 



Key for the Determination of Orders, Families and 



Genera of Pogonophora 152 



1. Order ATHECANEPHRIA IVANOV, 1955 154 



1. Family Oligobrachiidae Ivanov, 1957 154 

 /. Genus Oligobrachia Ivanov, 1957 154 



1. O. dogieli Ivanov 155 



2. O. ivanovi E. C. Southward 160 



2. Genus Nereilinum Ivanov, 1961 162 

 1. N. murmanicum Ivanov 163 



3. Genus Birsteinia Ivanov, 1952 169 

 /. B. vitjasi Ivanov 169 



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