240 APPENDIX. 
furnished 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 
seelng anemones crawling up the sides, so as to 
exhibit their entire basal disk, and then we may 
observe lhghtly 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 Caryophyllea. These are 
doubtless flexible walls of compartments dividing the 
fleshy parts of the softer animals, and corresponding 
with the septa of the coral. Fig. 2a@ represents a 
section of the latter, to be compared with the basal 
disk of Sagartia. 
SAGARTIA ANGUICOMA. fl. V. fig. 3, a, b. 
This genus has been separated from Actinia on 
account of its habit of throwing out threads when 
