KADIAKIA ECHINODERMATA. 



225 



formerly the Flustrse (fig. 10), but of late these have been 

 shown to be closely allied, if not identical with, the Tunicated 



9. CORAL (Madreporabrachiata). 



Mollusca, and have received the name of Polyzoa, they will 

 therefore be noticed under that head. 



The fourth class of the Radiata, are the Radiaria, including 

 two orders. The first of these are the Acalephse ; the Medusa) 



A B 



FIG. 10 SEA MAT (Flustra foliacea), (A, magnified, B, natural size). 



or Jelly-fishes belong to this order; these creatures float 

 about sometimes in great numbers, they are transparent 

 and gelatinous, of a hemispherical form, the flat surface being 

 fringed round with fibres, some of which sting like nettles if 

 brought into contact with the skin. 



The second order of the Radiaria include the Echinoder- 

 mata or Sea-hedgehogs, Star-fishes, &c., these are many of 

 them furnished with a profusion of spines, and hence their 



Q 



