280 NATURAL HISTORY OF 



lower margin entire and dentate; peristome elevated 

 and forming a secondary orifice, which is channelled 

 in front ; generally an avicularium below the sinus. 

 Zoariutn (in British species) either incrusting, or erect 

 and foliaceous, the cells in a single or double layer. — 

 T. H. 



1. S. Landsborovii, Johnston. 



Lepralia Landsborovii {G. J., Busk, McA., B. L., 

 T. H.), Eschara Landsborovii {Alder), L. crystallina 

 {A. M. N.), Escharella Landsborovii [Smitt], E. pertusa 

 {8mitt). 



Hab. : South Devon, Cornwall, Llandudno (T. H.), 

 Hastings {Miss Jelly), Ayrshire {D. L.), Scarborough 

 {Bea7i), Peterhead (C. W. P.). 



This species occurs in two forms, one incrusting and 

 of a white or reddish colour, and the other erect and 

 rising to a height of 2 inches. 



The walls are thin and hyaline, punctured round the 

 margin, and sometimes thickly dotted over the entire 

 surface. The peristome has a sinus or notch in its 

 lower margin, in which an avicularium is generally 

 placed. 



The erect form is foliaceous, and presents a crumpled 

 appearance, as if a number of small round papers were 

 crumpled together one within the other. 



2. S. RETICULATA, McGHUvray. 



L. reticulata {Macgillivray , G. J., B. L.), Escharina 

 rimulata (B'Orh.), Reptescharella rimulata {B'Orb.), 

 Escharella Legentilii {Smitt). 



Hab.: South Devon, Guernsey, Cornwall {T. H.), 

 Northumberland (Alder), St. Andrews (McL), Peter- 

 head (0. W. P.). 



This is a deep-water species forming silvery crusts 



