CONTENTS. 
Page 
Introduction . . . . . . . . . . . . . . 103 
Oriental Hydrozoa of brackish water. 
List of the Hydrozoa found in brackish water connected with the Indian Ocean 104 
Tolerant marine species . . . . . . . . 105 
Specialized brackish-water genera . . . . . . . . 105 
.Adaptive characters in these genera . . . . . . . . 106 
Hydrozoa of fresh water . . . . . . . . 107 
Hydrozoa of fresh and brackish-water compared . . . . . . log 
Systematic description of the Collection 
Hydrozoa. 
Cordylophora lacustris, AUman . . . . . . . . 110 
Bimeria fluminalis, Annandale .. .. .. .. ..iii 
Campannlaria serrulata, Bale .. .. .. ..iii 
Campanulina ceylonensis (Browne) . . . . . . . . 112 
Asenathia, gen. nov. . . . . . . . . . . . . 114 
A. piscatoris, sp nov. . . . . . . . . . . 114 
Liriope rosacea (Eschscholtz) • . . • • . • • 116 
Ctenophora. 
Pleurobrachia globosa ceylonensis, Browne . . . . . . . . 116 
