SEA-MAT MAKERS. 



303 



simultaneous movement of these appendages, we 

 see as perfect a transmission of will as in a single 

 animal." 1 



3 



FIG. 60. CELLULARIA CILIATA. 

 (a) Natural size. (b] Magnified. (g) Bird's-head process. 



The " bird's-head processes " are not present in all 

 species, nor on all specimens of the same species, 

 and when they are present it is only in connexion 



1 Darwin, " Voyages of Adventure and Beagle? vol. iii. 

 p. 259. 



