124 



LEPRALIA. 



appearance when slightly magnified by a simple 

 pocket-lens. Almost every sea-weed of any 

 dimensions, and especially the Laminarice, will 

 be partially covered with the cells of this zoo- 

 phyte, and it may also be found on shells and 

 other objects which have been submerged in the 

 sea for any length of time. There are nearly 

 forty British species of this single genus, and 

 if half a dozen specimens are examined, it will 

 probably happen that three or four will be 

 distinct species. 



