514 



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 bird's-head 

 process. This has been made the subject of investigation 

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

 tributed to the Transactions of the Microscopical Society, 

 1849, an admirable paper on the Notaraia bursaria> 

 " Shepherd' s-purse Coralline," (represented in fig. 244, 

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

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



Fig. 244. 



2, Notaviia l ur*aria, Shepherd' s-purse Coralline. 2, Angumaria spatulata, 

 Snake Coralline, growing with the Campanularia integra. 3, The Shepherd'* 

 purse Animalcule withdrawn into its cup, and the internal organism 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. 



