114 DAVENPORT ACADEMY OF SCIENCES. 



A very short stalk is present in this species, sometimes slightly 

 curved, but often represented only by a knob-like process. 



This species differs from Cothiirnia ovata chiefly in the slightly 

 everted margin of the lorica of the latter and the greater exten- 

 sion of the body. In Cothurnia imberbis the dilated ciliary border 

 is barely pushed beyond the margin of the lorica. 



Reproduction takes place by longitudinal division, the daugh- 

 ter-cell being shown in the plate figure in a contracted condition. 



Found in fresh water, attached to aquatic plants. Distribution 

 is very general. 



Cothurnia curva Stein. 



Lorica about twice as long as broad, anterior extremity slightly 

 curved. Stalk short and thick, sometimes curved. Lorica trans- 

 parent or opaque. Body slender, extending but little beyond the 

 margin of the lorica. 



Length of lorica, including stalk, no microns. 



The opaque phase of the lorica represented by Fig. 206, PI. 

 XXVIII, indicates the mature form and is usually reddish-brown 

 in color. Transparent or young individuals are often associated 

 with the adult specimens. Found in fresh water, but not so 

 abundant as Cothurnia imberbis. 



. Sub-class, SUCTORIA. 

 Family, PODOPHRYID^. 



SPH^ROPHRYA C. & L. 



Usually spherical, with capitate tentacles produced from all 

 parts of the periphery. Never producing a stalk. Sometimes 

 parasitic within other Protozoa. 



Sph^rophrya magna Maupas. 



Body spherical. Tentacles scattered irregularly over the sur- 

 face. Endoplasm granular. Nucleus spherical. Contractile ves- 

 icle usually single. 



Diameter of body, 36 microns. (Fig. 207, PI. XXIX.) 

 Found in diatomaceous ooze from a small stream in the vicinity 

 of Iowa City. The tentacles, which are usually equal in length 

 to the diameter of the body, are effectively used to catch small, 



