22 THE ZOOLOGIST. 



sided aquarium. It soon settled down, and in a few weeks both 

 its colour and habits changed. It has grown considerably, and 

 practically never closes but Bits attached to the side of the tank 

 or a stone, with the tentacles all hanging limply down and not 

 spread in an erect manner, as is usual in A. equina. Each year 

 it has produced a few young, all of the acquired olivaceous 

 colour. They, too, have grown very large ; I lately measured 

 the base of one attached to the glass, and found it was 6'4 x 4 cm. 

 across. Their acquired colour, which suits the surroundings, is 

 rather darker than that of Ascophyllum nodosum on the column, 

 whilst the disc, tentacles, and young are about the shade of the 

 yellowish green tips of A. nodosum. The edge of the disc and 

 the " beads " are still of a pale blue colour. In August a young 

 specimen, six months old, 1*4 x 2 cm. across the base, began to 

 divide, and completed its division in about three months. 



Urticina. 



In February, 1913, I found a single specimen of U. felina in 

 a most unusual situation. It was living in the middle of a sandy 

 bay, with just the top of the column protruding ; its base was 

 swollen so as to anchor it firmly in the sand. There were no 

 stones to which it could attach itself in the usual way. 



Stomphia. 



In July, 1910, in a tank containing several specimens of 

 Stomphia churchice, there were two specimens which had lived 

 within a few inches to a foot of each other for about a year. 

 When expanded, the smaller one was about 3 inches across the 

 tentacles, and the larger about 6 inches. At 7.50 p.m. on July 

 4th I observed the smaller one sitting right in the mouth of the 

 larger, both specimens being fully expanded. There was no 

 sign of any struggle, as though the larger were trying to eat the 

 smaller. The inner tentacles of the larger were adjacent to the 

 outer tentacles of the smaller, were waved about, and from time 

 to time touched those of the smaller. At 9.30 p.m. the smaller 

 specimen, still expanded, began to emerge from the mouth of the 

 larger, which curled back its tentacles on one side and protruded 

 its gullet, and so helped the smaller to get away. When the 



