222 APPENDIX. 



furnislied with a shell, and others even of the same 

 character and habits without one, so we find that 

 in spite of this seemingly important difference, the 

 animals are very similar in their nature. Since the 

 introduction of glass tanks we have opportunities of 

 seeing anemones crawling up the sides, so as to 

 exhibit their entire basal disk, and then we may 

 observe lightly coloured lines of a less transparent 

 substance than the interstices, radiating from the 

 margin to the centre, some short, others reaching the 

 entire distance, and arranged in exactly the same 

 manner as the plates of Caryophyllsea. These are 

 doubtless flexible walls of compartments dividing the 

 fleshy parts of the softer animals, and corresponding 

 mth the septa of the coral. Fig. 2 a represents a 

 section of the latter, to be compared with the basal 

 disk of Sagartia. 



Sagaetia anguicoma. pi Y. fg. 3, a, h. 



This genus has been separated from Actinia on 

 account of its habit of throwing out threads when 



