404 



chial organs ; the last or sixth pair are crustaceous, and 

 terminated by two nearly equal oval plates, of which 

 the outer is movable, and folds under the inner, which is 

 soldered to the basal support. 



They are vegetable feeders, and some species have 

 recently been described by Dr. Fritz Muller, from the 

 Brazils and Madras, which were found living as extensive 

 perforators in submarine timber. 



STUDLAND BAY. 



