THE CGELENTERATA 41 



questioned as to whether this is constant. I do not know, 

 but I have seen no exception. This last-named one is a 

 peculiar anemone. It has no raised column, so that when its 

 tentacles are retracted it is almost flat. Its " foot," instead 

 of being circular, as in all others, is so arranged that it fits 

 around the open end of the shell, in such manner that when 

 both crab and anemone are " extruded " the former appears 

 as if frilled with tentacles, like a lady with an exaggerated 

 feather tippet. Adamsia palliata is not frequently found 

 in the littoral zone ; it prefers fairly deep water, and the shell 

 to which it is attached is more often that of a large trochus 

 (Trochus majus) than that of the whelk. It may be a 

 question of depth of water that determines the different 

 associations mentioned, but a mixture of the two species, 

 each true to its own associate, is not infrequent in the same 

 haul of a dredge in about ten to twenty fathoms of water. 



In low-tide situations, chiefly in rock crevices, the 

 beautiful little white Sagartia nivea, will be found, and 

 another species, Sagartia venusta, with yellow disc and 

 white tentacles like a field daisy may be also there, 

 and where there is one there will be many. 



On the open sand, especially in proximity to fields of 

 sea-grass, there may be seen, sometimes in large patches, 

 the tentacle - encircled discs of the " Sand anemones " 

 (Sagartia bellis). There are many varieties of this, and all 

 are beautiful and curiously marked. A common variety 

 is as if the disc had been ruled crosswise that is, divided 

 into four sections and the opposite ones coloured deep 

 purplish chocolate, the two others grey or white. Some- 

 times all one side is chocolate, the other white ; in others 

 there are many sections, radiating like the spaces between 

 the spokes of a wheel, and these alternately coloured ; 

 others are simply speckled grey, brown, and white. The 

 average size of these is a couple of inches across the ex- 

 panded portion. 



