162 KANSAS UNIVERSITY SCIENCE BULLETIN. 



This is the longest species of Ciliate which I have yet seen. It is quite 

 conspicuous to the unaided eye. 



Found abundantly in pond and creek water. 



Lengths given vary from 520 to 4000 microns. Length of type specimen, 

 1450 microns. (Fig. 35, plate XL.) 



Spirostomnin teres C. & L. 



Body not so long in proportion to width as the preceding species, nar- 

 rower and rounded anteriorly, truncated posteriorly. Peristome not reach- 

 ing the middle of the body. Macronucleus single, ovate. 



This species is found wherever Spirostomum ambigumm is found. It 

 is considerably smaller than that species. 



Sizes given range from 300 to 650 microns. Length of type specimen, 

 650 microns. (Fig. 33, plate XL.) 



Family BursaridjE. 



Peristomal area broadly triangular and deeply sunken. 



Genus Condylostoma Duj. 



Body ovate to elongate, nearly cylindrical. Peristome short, triangular. 

 Left-hand border of peristome with adoral cilia, right-hand border with 

 undulating membrane. Mouth large, located at the apex of the peris- 

 tomal triangle. Pharynx small. Cuticular surface finely ciliated. Macro- 

 nucleus bead-like. Contractile vacuole varying. Anus postero-terminal. 



Condylostoma stag)iale Wrz. 



Body broadly ovate, less than twice as long as broad, widest posteriorly. 

 Peristomal area broadly triangular, occupying the entire anterior end and 

 extending posteriorly to about the middle of the body. Left-hand border 

 of the peristome with adoral cilia, right-hand border with a large undulat- 

 ing membrane. Longitudinally striated with conspicuous muscular fibrilla?. 

 Macronucleus bead-like. Contractile vacuole irregular in outline, postero- 

 terminal. 



This species was observed but once, in stagnant pond water. 



Average size, 200 microns. Length of type specimen, 150 microns. 

 (Fig. 30, plate XXXIX.) 



Family Stentorid^e. 



Peristome limited to the surface of the anterior end of the animal, at 

 right angles to the long axis of the body. Undulating membranes lacking. 

 Peristomal area straited with rows of strong cilia. 



Genus Stentor Oken. 



Protozoa either free-swimming or attached at will, sometimes secreting 

 a mucilaginous case or lorica. Pyriform, pear-shaped or ovate when un- 

 attached; trumpet-shaped when attached and expanded. Peristome cir- 

 cular, a spiral row of cilia around it with the left-hand end of the spiral 

 depressed and leading into the mouth. Pharynx short. Cuticular surface 

 longitudinally striated and covered with fine cilia. Long slender setae 

 sometimes present on the general surface. Macronucleus moniliform, 

 band-like or oval; micronuclei numerous. Anus and contractile near left- 

 hand side of the adoral wreath. Contractile vacuole, usually with tube- 

 like canal, leading from the posterior part of the body. 



