338 THE BIOLOGY OF STENTOR 



publication. He also allowed the species Stentor glohator Stokes, 

 1885, though questioning its validity. Since glohator is very similar 

 to multiformis {gallinulus?) and was described from a single speci- 

 men, I do not think there are adequate grounds for admitting this 

 species. Two marine species unique in having a notched membra- 

 neller band, the so-called S. auriculata Kent, 1881, with a compact 

 macronucleus, and S. auriculatus Kahl, 1935 (auricula Gruber, 

 1884), with a multinodal macronucleus, are probably variations of 

 the same species (see Andrews, 1948a). They have been shown to 

 be not stentors at all but to belong to the genus Condylostoma^ 

 because they have an undulating membrane and creep along the 

 bottom as well as attaching by the posterior end (Faure-Fremiet, 

 1936). Also with notched oral band is a non-pigmented ciUate 

 found in numbers on a branch of Fucus by Silen (1948) who pro- 

 posed the name Stentor acrobaticus. This interesting organism, 

 attaching by the posterior end or clinging by 2 folds of the lateral 

 body wall, ghdes along cross-striated filaments apparently of its 

 own making. Two compact macronuclei were stained. This is a 

 doubtful species because its contractility was not notable as in 

 stentors and neither feeding organelles nor lateral striping were 

 described. 



Hence there are about 1 3 known species of Stentor. This number 

 includes quite recent discoveries, suggesting that still more species 

 are to be found. I have myself seen two or three additional forms 

 which do not correspond to present descriptions, but I would not 

 give them names until more abundant collections are available. 



