BRITISH ZOOPHYTES. 85 



sporosacs, which mature their contents within the 

 capsule. — T. H. 



1. C. voLUBiLis, Linn. 



C. grimpante [De B.), Sei^tularia volubilis {Linn.), 

 S. uniflora {Pal.). 



Hab. : Widely distributed. Parasitic on zoophytes. 



Resembles G. Johnstoni, but is smaller, and has its 

 stem spirally twisted with a single ring below the 

 calycle. 



Ellis {" Corallines/^ 24) describes this species as the 

 " small climbing coralline with bell-shaped cups." 

 " It rises from small irregular tubes, which adhere to 

 and twine about other Corallines, especially H. falcata. 

 Exceedingly small twisted stalks go out from the 

 twisted stem, which support little bell-shaped cups 

 with indented brims. At the bottom of each, where it 

 joins the stalk, the microscope discovers to us a very 

 minute spherule or little ball, as in some drinking- 

 glasses." Sometimes the stem, instead of being 

 twisted, is found plain. Mr. Hassall thinks that the 

 ring beneath the calycle serves the purpose of a hinge 

 or joint to enable the zoophyte better to elude the rude 

 contact with the element by which it is surrounded, 

 permitting it to bend to a force which it cannot resist. 



2. C. HiNCKsii, Aid. 



Hab. : Rather rare. Torbay, Oban {HincJcs), North- 

 umberland and Durham {Aid.), Hebrides {A. M. N.), 

 North of Ireland {Thompson) , St. Andrew's {Mel.). 



This species was considered by Mr. Hincks at first 

 as a variety of G. volubilis, from which, however, it is 

 distinguished by having the stem generally smooth, 

 except that there are one or two twists at the base, 

 and by having two or three rings just below the calycle, 



