248 



CUTTLE-FISH, MOLLUSC A, ETC. 



animals, are not distantly related to other marine 

 objects called "sea-mats," whose dry brown fronds 

 are frequently to be picked up along the sea-coasts, 



Fig. 1 8 1. 



Sea-mat (Fiustra truneata). 



where they are usually mistaken for sea-weeds, and 

 mounted as such in albums. They are. however, 

 colonies of really highly organised individuals, of 



