IIYDROZOA. 



8i 



Glass 

 HYDKOZOA. 









/ 



No umbrella. 



\ 



An umbrella. 



An hydrorliiza. 



No hydrorliiza. 

 Oceanic. 



Locomotive. 

 Inhabiting fresh- water. 



Order I. 

 Hydride. 



Fixed 



"N 



i 



No hydrothecse 



Order II. 

 Corynidje. 



Hydrothecse. 

 Order III. 



SERTULARIDiE 



Polypites free from nectocalyces. Polypite sus- 

 pended from 

 the roof of a 

 nectocalyx. 



A 



■* 



No pneumatophore. A pneumatophore. 



Nectocalyces. 

 A Somatocyst. 



Order IV. 

 Calycophoridje, 



Nectocalyces 

 present or absent. 



Order V. 

 Physophorid^e. 



Order VI. 

 Medusidje. 



(J 



Order VII. 



LuCERNARID^E 



