PLANARIA EDINENSIS. 137 



though only one be visible at a time. A 

 planaria which had retreated among the 

 mud during the winter months, appeared 

 on the side of its vessel on the thirteenth 

 of February, bearing a single egg of light 

 chocolate colour, extremely conspicuous 

 through the thin integument below. In 

 three days it had been laid, and its place 

 was vacant ; but on the twentieth of the 

 month, another egg was seen in the site of 

 the former, or within a third of the anterior 

 extremity. I then removed the animal in- 

 to a watch-glass, where it might always be 

 accessible, in expectation of obtaining the 

 egg, and found it accordingly at the bot- 

 tom, on the following day. There was now 

 no appearance of any more in the parent ; 

 and on the twenty-third, a very minute 

 planaria of the same species, as nearly as 

 could be determined, was vivaciously tra- 

 versing the liquid. In the evening, how- 

 ever, the planaria exhibited a third egg, si- 

 tuated exactly as the two preceding, of 

 which also it had next morning divested 



