Marvels of Pond-Life. 45 



to the glass, when the wheels were protruded, and the 

 body swayed to and fro. Then the sucker action 

 ceased, and as the creature swam away, a tuft of cilia 

 was thrust out from the extremity of the tail. A power 

 of one hundred linear was sufficient to enable the 

 general nature of this beautiful object to be observed, 

 but to bring out the details, much greater amplification 



450 

 Pterodina patina — gizzard. 



was required, and this would be useless if the little 

 fidget could not be kept still. 



The size of the creature, whose name we may as well 

 mention was Pterodina patina, rendered this practicable, 

 but required some care. The longest diameter of the 

 body, which was not quite round, was about 1 — 120", 

 so that it was visible to the naked eye, and as a good 

 many were swimming together, one could be captured 

 without much difficulty, and transferred with a very 

 small drop of water to the live-box. Then the cover 



