THE BEGINNINGS OF IIFE. 



253 



gressed, one of the previously equal rays attached itself 

 to some neighbouring body, and then began to increase 



Fig. 65. 



Mode of Origin and Development of Vorticellce, after Pineau. 

 ( X 200.) 



in size so as to constitute a sort of pedicle. In this 

 form, according to Pineau, it resembled Actlnopkrys 

 tedkellata. Other pediculated specimens were soon 

 seen which had assumed a pyriform shape, and then 

 the pedicle was no longer contractile, though the other 

 rays still exhibited very slow movements. Some of 

 these organisms presented the trace of a circular mouth 

 at their free extremity, and specimens which had at- 

 tained this grade of development seemed to increase in 

 size, whilst the mouth became larger and was at last pro- 

 vided with a circle of vibratile cilia. . As the organisms 

 still further increased in size, the rays gradually disap- 

 peared, and the previously motionless pedicle also began 



