392 THE MICROSCOPE. 



species of the Flustrce the interior of the cell is protected 

 by a lid which bears some appearance to the head and 

 beak of a bird, and hence it is termed the birds-head 

 process. This has been made the subject of investigation 

 by many naturalists. George Busk, Esq., F.RS., 1 con- 

 tributed to the Transactions of the Microscopical Society, 

 1849, an admirable paper on the Notamia bmaria, 

 "ShepherdVpurse Coralline," (represented in fig. 202, 

 Nos. 1 and 3), which adds to our knowledge of this 

 curious process. He says : " This most beautiful pearl- 



Fig. 202. 



1, Notamia busaria, Shepherd's -purse Coralline. 2, Anguinaria spatula fa., 

 Snake Coralline, growing with the Campanularia Integra. 3, The Shepher 1's 

 purse Animalcule withdrawn into its cup, and the internal organism 

 shown greatly magnified. 



coloured coralline adheres by small tubes to fuci, from 

 whence it changes into flat cells ; each single cell, like 



(1) Mr. Busk has added to the description here given of this bird's-head 

 process in the Quarterly Journal of Microscopical Science, for January 1854. 



