CONTENTS 



Introduction 



Systematic Account 

 Anthomedusae 

 Leptomedusae 

 Limnomedusae 

 Trachymedusae 

 Narcomedusae 

 Narcomedusae : commensal larvae . 



ZOOGEOGRAPHICAL REMARKS .... 



Distribution of the species of Hydromedusae taken 

 Investigations ...... 



Neritic species of Leptolina .... 



Epipelagic species of Leptolina and Trachylina 



Bathypelagic species of Leptolina and Trachylina 



Summary of the zoogeographical results 



References 



Table i 

 Table 2 

 Table 3 

 Table 4 



Index of Genera and Species 



by the 



Discovery 



page 3 



4 

 4 

 27 

 41 

 45 

 63 

 89 



93 



94 

 96 



97 



98 



104 



106 



no 

 124 



125 

 126 



127 



