110 NATURAL HISTORY OP 



Sertularia rosacea {Ellis, G. J.), S. pinaster, var. 

 {G. J.), S. attenuata (T. E.). 



Hab. : Ilfracombej Swanage, Filey, Whitby (Hincks), 

 Brighton (Ellis). 



This species may be distinguished from the pre- 

 ceding " by its more erect and stiffer habit, and by its 

 decided horn colour, contrasting with the pearly white- 

 ness of D. rosacea." — HincJcs. In addition there is 

 often a tendril-like expansion of the stem. 



3. D. PALLAX, Johnston. 



Dynamena pinnata {Flem.), Sertularia pinnata((T. J".), 

 S. fallax {G. J., D. L., P. H. G., McA.). 



Hab. : North of England and Scotland. Height to 

 2 in. Stem thick. Calycles tubular, with wide plain 

 margin. Gonothecae bearing 4 erect spines, surround- 

 ing a tubular orifice. 



The peculiarity of this species consists in the number 

 of tendrils, which are " curled and thickened at the 

 extremities/' and which are extended from the ends of 

 many of the branches. These tendrils serve the pur- 

 pose of attaching it to other zoophytes, upon which it 

 is parasitic. The colour is white when living, becoming 

 dai'k on death. 



4. D. PINASTER, E. and S. 



Sertularia pinaster {E. and S., G. J., Aid., D. L., 

 P. H. G., McA.), Dynamena pinaster {Lamx.), S. mar- 

 gareta {Eas., G. J., T. E., D. L., P. E. G., McA.), 

 Diphasia margareta (Ag.). 



Hab. : Widely distributed. Height 2—6 in. 



This is the " Sea-pine Coralline " of E. and S. It 

 is pearly white in colour when living, becoming light 

 horn-colour when dried. The calycles are tubular, with 

 plain apertures projecting from the stem. The gono- 



