(vii) 



CONTENTS OF VOL V. 



PAGE 



INTRODUCTION 1 



HELIOZOA 14 



SUB-ORDER I. APHROTHORACA . . 15 



GENUS 1. ACTINOSPH^RIUJI 15 



2. ACTINOPHRYS 19 



SUB-ORDER II. CHLAMYDOPHORA . 25 



GENUS 3. ASTRODISCULUS . . 25 



SUB-ORDER III. CHAIAROTHORACA . . L'? 



GENUS 4. HETEROPHRYS . . .29 



5. RAPHIDIOPHRYS . . .:'.:'> 



6. POMPHOLYXOPHRYS 4fr 



7. LlTHOCOLLA . 44 



8. EL^ORHANIS ... 47 



9. ACANTHOCYSTIS . 49 

 SUB-ORDER IV. DESMOTHORACA . . .58 



GENUS 10. CLATHRULINA . . .58 



11. HEDRIOCYSTIS . . . .63 



GENERA NOT RECORDED FROM BRITISH ISLES . . .65 



PSEUDO-HELIOZOA . . 66 



INDEX . 70 



i -/ o ~f 



/ 



