CONTENTS 



PAOE 



PREFACE ..... ........ v 



SCHEME OF THE CLASSIFICATION ADOPTED IN THIS BOOK xi 



HEMICHOEDATA 



CHAPTER I 



CHORDA-PA AND VERTEBRATA HEMICHORDATA ENTEROPNEUSTA EX- 

 TERNAL CHARACTERS AND HABITS STRUCTURE GENERA DEVELOP- 

 MENT PTEROBRANCHI A CEPHALODISCUS AND RHABDOPLEURA PHORO- 



NIDEA PHOROXIS AND AcTINOTROCHA AFFINITIES OF THE HEMI- 

 CHORDATA ............ 3 



TUNICATA 



CHAPTER II 



INTRODUCTION OUTLINE OF HISTORY STRUCTURE OF A TYPICAL ASCIDIAN 



EMBRYOLOGY AND LIFE-HISTORY ..... .35 



CHAPTER III 



CLASSIFICATION : LARVACEA APPENDICULARIANS STRUCTURE, ETC. 

 ASCIDIACEA SIMPLE ASCIDIANS -SPECIFIC CHARACTERS COMPOUND 

 ASCIDIANS GEMMATION M EROSOMATA HOLOSOMATA PYROSOMA- 

 TIDAE THALIACEA DOLIOLTDAE SALPIDAE GENERAL CONCLUSIONS-- 

 PHYLOGENY ............ 63 



CEPHALOCHOEDATA 



CHAPTER IV 



INTRODUCTION GENERAL CHARACTERS ANATOMY OF AMPHIOXUS 

 EMBRYOLOGY AND LIFE-HISTORY CLASSIFICATION OF CEPHALOCHORDATA 

 SPECIES AND DISTRIBUTION . . . . . . . .112 



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