350 JULIA ELEANOR MOODY 



Entz, was probably synonymous with the form Spathidium dis- 

 covered by Diijardin. 



In the main, Ehrenberg's description taUies with that of Du- 

 jardin, differing from it only in the account of the anterior region 

 where he found the truncated edge bordered by distinct cilia. 

 Somewhat later, Perty, making a further study of this form, 

 discovered that these cilia surrounded a distinct mouth. 



In ''Sur la multiphcation des Infusoires Cilies," Maupas gave 

 a fuller description of this interesting organism, which he called 

 Spathidium spathula, placing it in the family Enchelinidae of 

 the holotrichous cihates, although he considered it intermediate 

 between the Enchehnidae and the Trachelinidae, inasmuch as 

 it posesses a form typical of the first family but shows in the 

 region of the mouth an approach to the structures found in the 

 second family. 



In the more primitive forms represented by Holophrys, the 

 mouth, a simple passage in direct communication with the 

 endoplasm, is terminal, but many gradations exist between this 

 condition and that found in Dileptus where it is situated at 

 the posterior end of a long narrow lobe. Intermediate condi- 

 tions are to be found in Spathidium, Enchelys and Nassula; 

 the first two possessing a slit-like opening, subterminal in position 

 at the anterior end; while in Nassula the opening is about one- 

 third the length of the body from the anterior end. According 

 to Biitschli this change in position of the mouth has come about 

 by the gradual shifting of this organ toward a ventral side until 

 it has come to occupy a more or less central position. 



In the flask-shaped body of Spathidium Maupas distinguishes 

 a rounded posterior portion, tapering anteriorly to form an elon- 

 gated neck, bearing at the truncated tip a sht-like mouth armed 

 with trichocysts. In common with the holotrichous ciliates, 

 the entire surface of the body is covered with cilia of equal length 

 except in the mouth region where they are somewhat longer. 

 In the long axis of the body, Maupas found a more or less sinuous 

 band-shaped nucleus accompanied by numerous micronuclei. 



This infusorian was found in February, 1911, in a Paramoe- 

 cium culture which had been brought to the laboratory of the 



