LIEBERKUEHNIA 



731 



covered in ponds in Germany by MM. Claparede and Lachmann, 

 and named by them Lieberkuehnia Wctgeneri.^ The whole sub- 

 stance of the body of this animal and its pseudopodial extensions 

 (fig. 570) is composed of a homogeneous, semi-fluid, granular proto- 

 plasm, the particles of which, when the animal is in a state of 

 activity, are continually performing a circulatory movement, which 

 may be likened to the rotation of the particles in the protoplasmic 



FIG. 569. Vtmipi/reUa gomphonematis : A, colony of 

 Gomphonema attacked by Vtimpyrellce; a, encysted state; 

 b, b, cysts with contents breaking up into tetraspores, d, d, 

 seen escaping at e ; at/ is shown a Vampyrella sucking out 

 contents of Gomphoneia-ce\ls, the emptied frustules of 

 which, ff, //, are cast forth. B, isolated Vampyrella creeping 

 about by its extended pseudopodia. 



network within the cell of a Tradescantia. It is a marked peculiarity 

 of the pseudopodial extension of this type that it does not take place 

 by radiation from all parts of the body indifferently, but that it 



1 Etudes surJes Infusoires et les Bldzopodes, Geneva, 1858-1861. The beautiful 

 figure of Lieberkuehnia, given by M. Claparede, has been reproduced by the Author 

 in Plate I. of his Introduction to the Study of the Foraminifera. 



