STUDIES IN ANIMAL LIFE. 



53 



ceive several small leeches, and flat oval Plana- 

 rice, wHte and brown ; and here also is a jelly- 

 like mass, of pale yellow color, which we know 

 to be a mass of eggs deposited by some shell- 

 fish; and, as there are few objects of greater inter- 

 est than an egg in course of development, we pop 

 the mass in. Here (Fig. 14) are two moUusks, Lim- 



Fig. 14— A, Iiiin(.EUs Stasnalis, or Water-snail. 



B, Planoebis. 



nceus and Planorhis, one of which is probably the 

 parent of those eggs. 

 And here is one which 

 lays no eggs, but brings 

 forth its young alive : it 

 is the Paludina vivipara 

 (Fig. 15), of which we 

 learned some interest- 

 ing details last month. rig.i5.— paiotihaVivipaba. 



