304 HISTORY OF BRITISH ZOOPHYTES. 



Ireland, common, W. Thompson ; on seaweeds, Cornwall, 

 Mr. Peach; on different kinds of algse, Devonshire, Miss 

 Cutler ; on Phyttophora rubens, Isle of Man, Miss S. Beever, 

 from Miss Hislop ; on Laminar ia saccharina, coast of Ayr- 

 shire, very common, D. L. 



This, though common, is a pretty species. It appears most 

 frequently, with us, in roundish patches of thin calcareous 

 crusts. The cells are sub-cylindrical, and pellucid, with a 

 few transverse plaits; they are often almost concealed by 

 a great number of globular ovarian capsules. Lieutenant 

 Thomas finds two varieties in Orkney ; one with the cells 

 touching, and the other with the cells separate, and the 

 intermediate space punctured. We received a variety from 

 Miss S. Beever, with bunchy ventricose cells, which we 

 at first thought L. simplex, but the cells want the thickened 

 rim. 



2. LEPRALIA TENTHS, A. H. Hassall. 



Hab. On rocks and shells. On Laminaria digitata, Dub- 

 lin Bay, Mr. Hassall; Cornwall, Mr. Peach; on Pecten 

 opercularis, off Sana Island, Mr. Hyndman; on P. varius, 

 Sidmouth, Mrs. Gatty ; on Laminaria sacckarina, Lamlasli 

 Bay, D. L. 



The cells are ovate and long in proportion to their 



