E. W. BERGER ON THE CUBOMEDUS^. 33 



Proboscis, Stomach, Phacelli. 32. The lips of the proboscis are 

 highly contractile by themselves. The movement of the stomach and 

 the phacelli goes on, after the lips are cut off, with increased vigor, 

 due to the stimulus of shock. The vigor and frequency of their 

 contractions, however, diminish quicker than that of the cut-off lips. 

 (See for Proboscis, 12, 15, 18, 26, 29 ; Stomach, 18, 24, 29, 31 ; Phacelli, 

 18, 24, 31.) 



Temperature. 33. Temperature does not seem to have much effect. 

 Some placed in a tumbler half full of water, in the bright sunlight, 

 swam vigorously over three-fourths of an hour. The water was quite 

 warm to the hand. 



34. The above experiment was repeated with the same results. 

 A thermometer placed in the water with them showed 92 F. ; hung 

 in the sun near by, it showed 94 F. 



Ice in the water did not stop their pulsating temporarily or 

 permanently, except that it did for a short time after being held 

 against one.* Even then it took some time (fifteen to twenty 

 pulsations) before it produced any effect. 



35. Ice placed in the water again showed no marked effect. They 

 swam as lively as ever. Some, after pulsating against the ice for a 

 little while, seemed to be less vigorous, but quickly recovered in 

 another part of the jar. Others did not seem to be the least bit 

 affected by contact with the ice. 



Food and Feeding. 36. I tried to feed one. A red and a white 

 copepod were put into the subumbrella cavity. No attempt to eat it 

 was observed in either case, though the copepods remained in the 

 subumbrella cavity for some time. 



Animals found in the stomach of Charybdea: small fish were 

 most frequently seen; at another time a small stomatopod; again, a 

 small polychiete ; small shrimps ; amphipod. 



Those taken on August 16th (3 to 4 P. M,) seemed to have, for the 

 most part, food in the stomach, and this more so than those taken in 

 the morning. 



Occurrence of Charybdea. 37. In the first tow on the bottom 

 (with a net made of mosquito-netting and weighted with rocks in 

 order to sink it) the haul was forty. I do not think that we could 

 have been towing more than four or five minutes. The time was 



