514 



THE MICROSCOPE. 



species of the Mustrce 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 thin 

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



Fig. 244. 



J, Notntnia lursaria, Shepherd' s-purse Coralline. 2, Anguinaria spatulata, 

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

 purse Animalcule withdrawn into its cup, and the internal organism 

 shown greatly magnified. 



coloured coralline adheres by small tubes to fuci, f-om 

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



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

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



