EXPLANATION OF PLATE IX. 



Hydrozoa and Ctenophora. 



Figs. I, ia, lb. — Clytia serrulata (Bale). 



i. — Hydrothecae and hydranth (much enlarged). 

 la, iô.— Gonothecae from the same specimen (same magnification). 



Figs, 2 t 2a, 2b. — Phialidium cruciferum, sp. nov. 

 2.— Type specimen of medusa as seen from below (much enlarged). 

 2a. — Part of the margin of the bell in a slightly younger medusa (further 



enlarged). 

 2b. — Dorsal surface of stomach of the type specimen with proximal part of 

 radial canals (same magnification as in fig. 1). 



Figs. 3, 3a. — Bimeria fluminalis, sp. nov. 



3.— Terminal part of a colony from the Chilka Lake (enlarged). 

 3a. — Female gonosomes from a living specimen from near Calcutta examined 

 under pressure (at a slightly greater magnification). 



Figs. 4, 4a, 4b, 4c. — Dicyclocoryne filament ata (Annandale). 



4. — Hydranth bearing gonosomes (much enlarged). 

 4a. — Terminal part of a tentacle of the same hydranth (further enlarged) as seen 



from in front. 

 4b. — Young medusa (much enlarged). 

 4c. — A tentacle of the same specimen seen from the inner surface (further 



enlarged). 



Fig. 5. — Pleurobrachia globosa, Moser var. bengalensis , nov. 

 Lateral view of a specimen preserved in formalin (enlarged). 



