40 



Transactions Tennessee Academy of Scien' 



Fig. 1. The Blue Stentor (Stentor caeruleus Ehr.). he. liody cilia; dc, 

 discal cilia; vi, membranellae; f, funnel; mo, mouth; p. pouch; /;, nucleus. 

 A stream of water is brought against the disk by the action of the mem- 

 branellae, ;;/. Particles in the stream of water impinge upun the disk 

 whence they arc slowly carried to llic pnuch and funnel. If tlie particles 

 are of food value they pass down througii the mouth, mo, into the internal 

 protoplasm ; but if the particles have no food value, they are thrown out 

 over the edge of the pouch. The stentor is shown in normal extended 

 position attached to some solid support. Natural size of stentor, about 

 thrcc-(iuarters mm. long. 



