186 CAMPANUHNIDJ-:. 



Family II. Campaimlhiidse. 



HYDROTHEC.E ovato-conic, pedicellate ; POLYPITES cylindri- 

 cal, ivith a small conical proboscis. 



IN this family the campanulate calycle disappears, and 

 the polypite is of the long, slender, cylindrical type, taking 

 its origin at the very base of the hydrotheca and termi- 

 nating above in a short, conical proboscis, instead of the 

 large trumpet-shaped organ which belongs to the true 

 Campanulariidce. 



Genus CAMPANULINA, Van Beneden. 



Der. From Campanula, a bell. 



GENERIC CHARACTER. Stem simple or branched, rooted 

 by a thread-Hike stolon ; hydrothecce produced and pointed 

 above ; polypites cylindrical, with ivebbed tentacles ; repro- 

 duction by free medusiform zooids, a single one of which is 

 contained in each capsule. 



Gonozooid: Umbrella (at the time of liberation] deep 

 bell-shaped; manubrium short and ^-lipped; radiating 

 canals 4 ; marginal tentacles 2 or 4, with bulbous bases ; 

 lithocysts 8, borne on the margin of the umbrella, one on 

 each side of the primary tentacles. 



THE medusiform zooid in its earliest stage bears a gene- 

 ral resemblance to that of Clytia, and subsequently passes 

 through much the same course of development. The 

 tentacles and lithocysts increase in number ; and the um- 

 brella, which is at first deep bell-shaped, becomes more and 

 more depressed, and finally assumes the shape of a flattened 

 segment of a sphere. These changes have been observed by 

 A. Agassiz in the Oceania languida, which is no doubt the 

 reproductive zooid of a member of the present genus. The 

 tentacles in this species increase from two to about forty. 



