2 THE AMERICAN NATURALIST [Vol. XLI 



in diameter, was inverted over the animal, the edgeg resting on the 

 dorsal side and about 30 milhmeters from each end. Instead of 

 making any effort to escape the animal retreated beneath the finger- 

 bowl and at the expiration of 30 minutes had made no effort to 

 escape. 



At this point in the experiment, my patience proved inferior to 

 that of the holothurian" and I lifted the finger-bowl. When this 

 was done a specimen of the interesting genus Fierasfer, which I 

 have identified as F. affinis, was found. Evidently it had been 

 driven to leave its host on account of the deficient supply of oxygen. 

 The fish, which was nearly transparent, measured 124 millimeters 

 in length, and was very slender, tapering almost uniformly from 

 the head to the tip of the long and whip-like tail. 



As soon as the finger-bowl was removed the fisli beijan to swim 



actively about in the dish. It kept its nose close to the surface of 

 the water, and at times even thrust its head above the surface in 

 its eagerness to get oxygen. 



After a few minutes it ceased to swim at the surface but appeared 

 to be still uneasy. No test was made to prove what seemed to be 

 indicated by its actions, viz., that its sense of sight is defective. 

 Judging from its subsequent behavior it was even then trying to 

 find its customary quarters, but, to those of us who were watching, 

 its movements began to be somewhat aimless. 



