JOUENAL 



OF THE 



EOYAL MICROSCOPICAL SOCIETY. 



DECEMBER, 1919. 



TRANSACTIONS OF THE SOCIETY. 



-•o^ 



IX. — On Folliculina holtoni (S. Kent). 

 By E. Penard, Sc.D. 



{Read April 16, 1919.) 

 Two Plates. 



In July 1918 I found on the underside of leaves of water-lilies in a 

 pond of the Ariana Park, near Geneva, a Ciliate Infusorian which I 

 thought must undoubtedly belong to the genus Folliculina. 



Referring to the classical work of Butschli (" Protozoa," p. 1729), 

 I found, accompanying the diagnosis, the following lines : " Marine. 

 Coasts of Europe and North America (fresh-water also, according 

 to Kent, Freia holtoni ; however, wants confirmation ; Barrett also 

 speaks of having found Folliculina in fresh-water)." A little 

 further on, Butschli says again : " In the neighbourhood of Follicu- 

 lina might also be placed the fresh- water genus Ascohius (lentus), 

 imperfectly described by Henneguy." . . . " In case it were a 

 Folliculina, it might be identical with Kent's F. holtoni." 



Referring then to the original authors, I ascertained that Kent 

 had seen in fact a Folliculina, and evidently the same as the one 

 which I had recently found. Barrett simply says that he found, 

 in the Thames at Moulsford, his Stentor harretti " whilst looking 

 for Lagotia* which I had found before on weed from the above 

 locality (though Pritchard quotes Lagotia as a marine animal)." 



Henneguy's description of Ascohius is precise enough to make 

 us certain that he had to do with the same species ; but the French 

 author only saw retracted specimens. " I never saw," says 



• Another name for Freia or Folliculina. 



