HYDROMEDUSAE, 



WITH A REVISION OF THE WILLIADAE AND PETASIDAE. 



By Edward T. Browne, B.A., Zoological Eesear-ch Laboratory, 

 University College, London. 



(With Plates LIV.— LVII.) 

 CONTENTS. 



PAGE 



Anthomedusae. 



Revision of tlie family Williadae 724 



Proboscichictyla tropica, species nova (Pacific Ocean, Huxley) . . . . . . 727 



Prohoscidactyla varians, species nova .......... 728 



Leptomedusae. 



Phialidium tenue, species nova ........... 730 



Pseudodytia gardineri, species nova . . . . . . . . . . 731 



Aequorea -nuddivensis, species nova ........... 732 



Mesonema pensile (Modeer) ............ 733 



Trachomedusae. 



Revision of the family Petasidae ........... 735 



Olindias singularis, species nova ........... 737 



Liriope tetraphylla (Chamisso et Eysenhai'dt) ......... 738 



Aglaitra hemistoma Peron et Lesueur ......... 739 



Amijhogoiia apsteini (Vanhuften), genus novum ........ 739 



Narcomedusae. 



SohnundeUa bitentaculaia (Quoy et Gaimard) . . . . . . . . . 741 



SiPHONOPHOEA. 



Calycophorae. 



Diphyes chamissonis Huxley ............ 742 



Diphyopsis campanulifera (Eschscholtz) . . . . . . .• . . . 743 



Abyla trigona Quoy et Gaimard ........... 743 



Physophorae. 



Agalmopsis sp. .............. . 744 



Physalia utriculus Eschscholtz ........... 744 



Velella sp 744 



