!ll(>.)^(. 



LIFE-CYCLE OP " CYSTOBTA " IRREGULARIS (mINCH.). 1 



The Life-Cycle of "Cystobia" irregularis (Minch.), 

 together with Observations on other " Neo- 

 gamous " ' Gregarines.- 



By 

 II. m. Woodcock, D.ScXond. 



With Plates 1—0. 



Contents. 



Preface ..... 



1. Introduction .... 



2. Methods ..... 



3. Habitat and Mode of Life 



4. Form, Size, and General Appearance 



5. Minute Structure .... 



6. Commencement of Sporulation 



7. Nuclear Multiplication 



8. Formation of Gametes and their Conjugation 



9. Spore-formation and Systematic Position . 



10. Precocious Association or " Neogamy '" 



11. General Significance of Association 



Detailed Summary 

 General Summary 

 Analysis of Contents 

 Bibliography 

 Explanation of Plates 



PAGE 



1 

 3 

 6 



11 

 19 

 24 

 34 

 40 

 48 

 55 



CI 

 70 



83 

 89 

 90 

 92 



Preface. 



The Gregarines of Holothurians were first brought to my 

 notice by Professor Minchin, who suggested that I might suit- 



' From vtog, young, and yafiog , marriage, on tiie analogy of Neosporidia. 

 I am indebted to Prof. Minchin for suggesting this appropriate and convenient 

 term. 



- Thesis approved for the Degree of Doctor of Science in the University 

 of London. 



VOL. 50, PART 1. — NEW SERIES. 1 



