Marvels of Pond-Life. 



41 



municate with other vessels^ and, as wc have previously 

 stated, are probably connected with respiration and 

 excretion. 



Paramecium aurelia. 

 A dried specimen showing the vesicles. — Pritchard. 



The genus Paramecium is now confined to those 

 creatures which exhibit rows of longitudinal cilia of 

 uniform length, which are destitute of hooks, styles, or 

 other organs of motion than the cilia, which have a 

 lateral mouth, and no eye-spots. One mode of increase 

 is by division, which may be easily observed ; another 

 is through the formation of true eggs as traced by 

 Balbiani. 



Another of the treasures from the pond was a species 

 oi Tracheliiis J or long-necked ciliated animalcule, which 

 kept darting in and out of a slimy den, attached to the 

 leaf of a water-plant. The body was stout and fish- 

 shaped, the tail blunt, and the neck furnished with long 

 conspicuous cilia, which enabled the advancing and 

 retreating movements to be made with great rapidity. 

 The motions of this creature exhibit more appearance 

 of purpose and design than is common with animal- 



