94 NATURAL HISTORY OF 



Calycles witli an operculum formed of many converging 

 and acuminate segments. Polypites cylindrical, with 

 the tentacles webbed below. Reproduction by free 

 medusiform gonozooids. — T. H. 



The difference between this genus and the preceding 

 is that the adult gonozooids of the present genus have 

 many radiating canals, whereas those of Campanulina 

 never have more than four. 



1. Z, viTRiNA, Gosse. 



^quora vitrina (P. K G., T. S. W.). 



Hab. : Ilfracombe (Gosse), Scotland {Wrigld). 



Polypites very minute. The sexual zooid is described 

 by Mr. Gosse (" Devonshire Coast/^ 340) under the 

 name JEqiiora vitrina, or the glassy -^quora. He 

 describes it " as an exquisitely beautiful translucent 

 species, without a trace of colour in the whole animal, 

 and luminous when irritated in the dark.'^ Dr. Wright 

 hatched the ova of this medusa, and traced the deve- 

 lopment into minute polypites, invisible to the naked 

 eye. The tentacles are united by a web for about one- 

 third of their length. 



Genus III. Opekculaeella, EincJcs. 



Stem simple or branching, rooted by a thread-like 

 stolon. Calycles ovato-conic with a cleft border, the 

 segments converging to form an operculum. Polypites 

 long, cylindrical, and with a conical proboscis. Repro- 

 duction by means of fixed sporosacs. — T. H. 



" This genus is constituted from the Campanularia 

 lacerata of Johnston.'" 



1. O. LACERATA, G. J. 



Campanularia lacerata {G. J., V. B., D. L., P. H. G.), 



