PTERODINA PATINA. 61 



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 was required, and this would 



Pterodina patina— gizzai'd. 



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 



