BPvlTISH ZOOPHYTES. 233 



N. BURSARiA^ Linn. Plate XIX. fig. 1. 



Sertularia bursaria (Linn., Berk., Stew.), S. bursa 

 [Tiirt.), Cellularia bursaria {Pall., Ellis), Cellaria bur- 

 saria {E. and 8., Lamlc), Dynamena bursaria {Lamx., 

 Be B.), Gemicellaria bursaria {De Bl., D.L.), Epistomia 

 bursaria {Gray). 



Hab. : Isle of Wight {Busk), Swanage (Hincks), 

 Hastings {Kingsley). 



This species derives its specific name from the re- 

 semblance of its cells to the pods of the " Shepherd's 

 Purse," from which Ellis (" Corallines," 41) called it 

 the " Shepherd's Purse Coralline." His description, 

 which is as follows, is accurate and interesting : " This 

 most beautiful pearl-coloured Coralline adheres by 

 small tubes to fuci, from whence it changes into flat 

 cells; each single cell, like the bracket of a shelf, 

 broad at top and narrow at bottom. These are placed 

 back to back in paii-s one above another on an ex- 

 tremely slender tube, which seems to run through the 

 middle of the branches of the whole coralline. The 

 cells are open at the top. Some of them have black 

 spots in them, and from the top of many of them a 

 figure seems to issue out like a short tobacco-pipe, the 

 small end of which seems to be inserted in the tube 

 that passes through the middle of the whole. The cells 

 in pairs are thought by some to have the appearance 

 of the small pods of the Shepherd's Purse ; by others, 

 the shape of the seed vessels of Vei-onica or speed- 

 well." 



This tobacco-pipe appendage alluded to is, of course, 

 the avicularium. 



