FLUSTHA. 351 



umberland, Miss Dale; Yorkshire and Orkney, Lieut. 

 Thomas, E.N. ; Stonehaven, Lady Keith Murray ; Peter- 

 head, Mr. Peach; Dublin Bay, M^Calla; Leith and New- 

 haven, on the fishermen's nets, in some abundance, D. L., 

 jun. 



This pretty little Fhistra bears considerable resemblance 

 to F. avictdaris, but the cells, which are larger and more 

 raised, are armed with more spines, and from various parts 

 of the polypidom there are long tubular fibres thrown out 

 to attach it to other bodies. It is often landed with bird's- 

 head appendages. 



^^■^ Crustaceous. 

 8. Flustra membranacea. Shagreen Sea-mat, Ellis. 

 Hab. On Laminarice, common. 



This forms a beautiful gauze-like incrustation on the 

 broad frond of several seaweeds, but especially of Laminaria 

 digitata. When it is upon a narrow frond I have seen it, 

 though rarely, spreading itself a little beyond its support, 

 and the portion that was free had cells on both sides. 

 Young patches of it on the dark L. digitata are peculiarly 

 beautiful, being of a pure silvery colour, with a gracefully 

 rounded margin. The cells are quadrangular, — longer, how- 

 ever, than broad, — with a blunt hollow spine at each angle. 



