RADIATA. 



175 



erally regarded as a sea-weed by sea-side visitors, but a 



very cursory examination with a pocket lens will suffice 



to show the horny and branched polypary, with its little 



cups, (Itydrothecce?) 



which contain and 



protect the poly- 



pites. In some of 



the Sertularians 



the Medusae wither 



on the stock, never 



becoming free. 



The Campanula- 

 rian family (Cam- 

 panula, a little bell) 

 resemble Sertula- 

 rians, except that 

 the cups (Jtydro- 

 thecce) are stalked 

 and terminal in- 

 stead of being lat- 

 eral and sessile, as 

 in the latter. The 

 reproductive caly- 

 ces, or ovarian cap- 

 sules, may contain 



many Medusae FIG. 7 5 .-Campanularia gelatinosa : A. Upper part of 

 L j i i , the stem and branches, of the natural size. B. A small 



evelOped port i on enlarged, showing the structure of the animal. 

 One below the Oth- a ' Terminal branch bearing polyps, b. Polyp bud par- 

 tially developed, c. Horny cell, containing the expanded 



er, which are Set PlyPi ^. e - Ovarian capsule, containing medusiform 

 gemmae in various stages of development, f. Fleshy sub- 

 free by the bursting stance extending through the stem and branches, and con- 

 11 / necting the different polyp-cells and ovarian capsules. 



O* the Cell. (P Ig. 75 ) Annular constrictions at the base of the branches. 



