148 MICROSCOPY FOR BEGINNERS. 



a. Body long, and narrowly trumpet-shaped, the front 



divided into two lobes, one of which is almost at 

 right angles to the other. The body has many 

 long, fine hairs projecting from it, and 

 visible under a high-power (^ inch) ob- 

 jective. The sheath is always present. 

 It is narrow, cylindrical, brown, and 

 about one-half as long as the extended 

 body. This Stentor is never free-swim- 

 . m i n g> an d i g never found in company 

 ntor w j t jj ot h e rs of the same species. It is 



Barretti. 



not uncommon on Ceratophyllum. S. 

 Barretti, Fig. 115. 



J. Body green or red, the red color often being lim- 

 ited to the part just beneath the wide front bor- 

 der where the circle of large cilia is. Sometimes 

 the red color is diffused over the whole body, but 

 usually the green matter so obscures it that it is 

 invisible. This species is often ex- ^ 

 tremely abundant at the bottom of Jfjp' 

 shallow ponds in early spring. The r 

 green color then always entirely con- stentor 

 ceals the red. S. igneus, Fig. 116. igneu8 ' 



b. Body large, indigo blue. This in shape resembles 



Fig. 114 when extended ; when contracted it is 

 not unlike Fig. 116. Yery common in some lo- 

 calities. S. ccerideus, 



b. Body dark brown, almost black. This also resem- 

 bles Fig. 116. Common. S. niger. 



