84 NATURAL HISTORY OP 



Hab. : Common. Height 2 inclies. Stem slender, 

 branched, horn colour. Calycles bell-shaped, placed 

 alternately on the branches and borne on short ringed 

 pedicels, the branches themselves being ringed above 

 the point where the pedicels are attached. The rim, 

 though at first sight entire and plain, is seen to be 

 really somewhat wrinkled. 



This species is the " Sea-thread Coralline " of Ellis, 

 who says, '' that it seems curiously contrived from its 

 structure to resist the violence of the waves, all its 

 joints being furnished with springs." 



5. 0. PLABELLATA, HincJcs. 



? Sertularia dichotoma {Dal.), Campanularia flabellata 

 (T. H.). 



Hab. : Tenby (Aid.). Height 8—10 in. 



This species, often confounded with the preceding, 

 differs from it in being larger, more flexuous, and in 

 having its calycles triangular in shape. 



Described by Mr. Hincks in Annals of Nat. Hist. 

 (3rd ser.), xviii. 297, under the name Campanularia 

 flabellata. 



6. 0. (?) PLiCATA, Hincks. 



Hab.: Shetland (Jeffreys). Height 3 — 4 in. 



This species has a thick compound stem. The 

 calycle is very like that of 0. dichotoma. 



It is provisionally referred to this genus by Mr, 

 Hincks, who figures it at Plate XXX. of his " British 

 Hydroid Zoophytes." 



Genus III. Campanularia, Zamarc/c (I'ji^ar^). 



Stem as in last genus. Hydrothecce bell-shaped and 

 hyaline without operculum. Polypites with a large 

 cup-shaped proboscis. Gonopliores containing fixed 



