COLOUR NO SPECIFIC MARK. 151 



back again to green : and a Weymouth Anemone turn 

 from pearly-white to a soft reddish-brown. In fact the 

 changes of colour, except in the Crassicornis, which 

 appears to me to retain its hues with tolerable con- 

 stancy, are far too frequent to admit of colour forming 

 a specific character. 



