PLANARIA EDINENSIS. 139 



symmetrical to the naked eye, are rude and 

 deformed under the microscope ; but it is 

 otherwise with the egg of the planaria 

 Edinensis, which still remains a regular 

 and equal sphere when viewed with the 

 highest magnifiers. 



One young animal is excluded in twenty- 

 eight days from each egg, at first milk- 

 white, and endowed with uncommon viva- 

 city. 



The reproductive powers of this planaria 

 have much less energy than those in the 

 species above described of the other divi- 

 sion. Artificial sections are long of acqui- 

 ring the defective parts ; and when they do 

 vegetate, they are not so well defined. Du- 

 ring a mild season, neither the head nor 

 the eyes were evidently in progress to re- 

 production during fourteen days. 



This animal is of a shy and timid disposi- 

 tion ; for months it dwells constantly in the 

 mud, nothing except the snout being protru- 

 ded above it. If venturing to traverse the 

 surface, it hastily retreats to concealment on 



