BRITISH ZOOPHYTES. 79 



white di?tal extremity. Eeproduction is by fixed 

 sporosacs. Prof. G. du Plessis has investigated the 

 structure and development of the polypite.* 



Sub-Oedee II. THECAPHORA. 

 FAMILY I. CAMPANULARIID^. 



HydrothecfB ijedicellate, campaiiulate. Polypites ivith a 

 large trumpet-shajjed proboscis. — T. H. 



This family includes some of the most beautiful 

 forms of Hydroida. The calycles often transparent, 

 with their flower-like contents, form exceedingly pretty 

 objects, and the gracefully branched appearance of 

 some species makes them conspicuous amongst zoo- 

 phytes for delicacy and loveliness. The classification 

 of the members of this family presents great difficulty, 

 as it depends mainly upon the reproductive system. 



Genus I. Clytia, Lamouroux (in part). 



Stem simple or slightly branched, rooted by a 

 creeping stolon. Hydrothecce bell-shaped, without 

 operculum. Polypites with a large trumpet-shaped 

 proboscis. Gonothecce borne on the stolon and on the 

 stems, producing free medusiform zooids. Gonozooid 

 (at the time of liberation) almost bell-shaped, marginal 

 tentacles 4. Lithocysts 8, placed on the free margin 

 of the umbrella. — T. H. 



1. C. JoHNSTONi, Alder. Plate IV. fig. 2. 



* M. T., Zool. Sta. Neapel., ii (1880), pp. 176—196. 



