254 NATURAL HISTORY OP 



(TF. Thompson) , Lepralia biforis (6r. J., D. L.), L. 

 Malusii {Buslc, Heller, Manzoni), L. tliyreophora (Busk), 

 Herentia biforis (Gray), Escharina cornuta (D'Orh.), 

 Beptoporina Malusii and R. bexagona (D'Orh.), Porina 

 Malusii (Smitt). 



Hab. : Strangford Lough {Thompson) , Larne [Patter- 

 son), Ayrshire Coast (D. L.), Sidmouth {Mrs. Gatty), 

 Wick {C. W. P.), Guernsey, South Devon, Cornwall, 

 Isle of Man {T. H.). 



This is a well-marked species. The cells are ovate 

 and glistening, punctured except in the centre. The 

 orifice is armed with three or four spines. The median 

 pore is half-moon shaped, very large, and '' guarded 

 with delicate teeth so as to act as a sieve or strainer." 



3. M, iMPRESSA, Aiidouin. Plate XX. fig. 8. 



Flustra impressa {Aud., Savigny), Lepralia granifera 

 (G. J., Bush, D. L., Aid.), L. pyriformis {Bush). 



Hab.: Holy Island, Berwick Bay {G. J.), Cornwall 

 {0. W. p.), Saltcoats {D. L.), Shetland (^. if. iV.), Ilfra- 

 combe, South Devon, Isle of Man (T. H.). 



The following notes by Mrs. Gratty describe this 

 species : — " The typical forms of M. impressa (L. grani- 

 fera, Johnston) may be considered to lie between two 

 extremes. One extreme variety lies flat to the sea- 

 weed, and is cut into a finely-marked diamond pattern, 

 round the four sides of which are a row of dots or 

 punctures. There is also an opening below the mouth " 

 (the median pore, which is circular in this species). 

 " The pure transparency of the cell in its young con- 

 dition — varied by a thicker line which marks out its 

 diamond shape, and in which lie the row of dots — 

 makes it a very pretty object. It is so glassy in 

 texture that the colour of the red phyllophora can be 



