SPIROTRICHA, CTENOSTOMATA 831 



3 often long ribbon-like cirri on peristome; fresh or salt water. Sev- 

 eral species. 



M . bipartitum (Gourret and Roesner) (Fig. 353, g). 35-50/z long; 

 two caudal processes; salt water. 



Genus Atopodinium Kahl. Posterior left side with one large, and 

 right side with 2 indentations; macronucleus spherical; sapropelic. 



A.fibulatum K. (Fig. 353, h). 4O-50m long. 



References 



Kahl, A.: (1932) Ctenostomata (Lauterborn) n. Subord. Arch. Pro- 

 tist., 77:231. 



(1932a) Urtiere oder Protozoa. Dahl's Die Tierwelt Deutsch- 



lands, etc. Part 25. 



Lackey, J. B.: (1925) Studies on the biology of sewage disposal. 

 The fauna of Imhoff tanks. Bull. New Jersey Agric. Exper. Sta- 

 tion, no. 417. 



