I'ft 



« 



to 



in 



to 



ACTINOZOA. 



211 







oceanic, and described by such names as " Polypes 

 nageurs." It is more probable, however, that, 

 under ordinary circumstances, these creatures live 

 with their proximal extremity plunged firmly into 

 the sand or mud of the sea-bottom; the distal 



%• 37- 



a 



Pennatulidje and Gorgonidje : — a, dried stem of Virgularia 



mirabilis ; b, portion of another stem, in the living condition ; c, 



corallum of Mopsea costata ; d, fragment of the same, {a is 



reduced one-third ; b and c are of the natural size ; d is magni- 

 fied.) 



end of the coenosarc, which bears the numerous 

 polypes, freely exposing itself to the influence of 

 the clearer water above. 

 The coenosarc of the Pennatulidce may be 

 er and simply elongate, with very short 



p 2 



slend 



