18 JOHNS HOPKINS UNIVEESITY MORPHOLOGICAL MONOGRAPHS. 



temperate medusae. Romanes' Sarsia became frantic when placed in 

 milk-warm water. 



While writing the above, I was led to wonder whether the 

 temperature of the water may not have been the stimulating 

 influence in those experiments on light (previously noted) in which 

 the medusae continued to swim actively in the sunlight. 



Food and Feeding. See Experiment 36. 



I again make note of a few observations made by myself on 

 the Olindiad. A crustacean became entangled in the tentacles of a 

 medusa ; apparently this wished to retain it, for the proboscis reached 

 in the direction of the crustacean, which, however, got away. I then 

 placed, by means of a needle, another small crustacean against one of 

 the tentacles. This was seized but not retained, for the animal 

 pulsated and it was washed away by the water. Twice I saw a good- 

 sized crustacean in the proboscis. In one instance the velum appeared 

 to hold the part of the crustacean not yet in the proboscis. I noticed 

 another with a crustacean wholly in the proboscis, which was much 

 lengthened out, the upper part of the crustacean being in the stomach. 

 The next morning the crustacean was wholly in the stomach and the 

 proboscis normal. At 5.30 p. M. the crustacean was ejected, nothing 

 but the shell and some rubbish remaining. 



These medusae seem to pay no attention to being touched by one 

 of their kind, except to give a pulsation or two. 



The proboscis appears very "intelligent" in its actions.* First, 

 some of the tentacles can be seen to contract and to bend inwards, 

 then the side next the tentacles contracts and the proboscis is seen 

 to reach in that direction. I could not see, however, what the irritant 

 was. 



Occurrence of Charybdea Experiments 37-40. Dr. Conant's remarks 

 ("Cubomedusae") on the occurrence of Charybdea at the surface of 

 quite shallow water and near the shore (which is quite at variance 

 with former observations, that the Cubomedusae are essentially deep- 

 sea forms) are further borne out by his observations at Port Antonio. 

 As already noted in the Introduction, Charybdea was here found in 

 abundance in quite shallow water and near shore, but on the 



* By no means do I wish to attribute intelligence to these animals. 



