PLANARIA PANNICULATA. 39 



engross a number within its limits, admit- 

 ted of their inspection by the microscope ; 

 and, when greatly enlarged, they exhibited 

 an irregular figure, and uncommon inequa- 

 lity of size. 



This planaria is not one hundredth part 

 so common as the former, in places to which 

 I have had access, perhaps from its favou- 

 rite plants being rare ; and I remember 

 when pursuing such investigations, that, in 

 a certain pool where the black planaria was 

 numerous, it never occurred among them, 

 though occasionally found in their joint 

 aquatic abode at some little distance. But 

 there the plants in question vegetated. 



The planaria panniculata receives ani- 

 mal substances with less avidity than most 

 other species, and seems more liable to de- 

 cline in bulk, when removed to an apart- 

 ment. Its proboscis is of singular length, 

 and exactly trumpet-shaped at the extre- 

 mity. Probably leaves are punctured by it 

 to extract nutritious matter. 



This species is also akin to the former, 



