170 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Vorticella cucullus From. 



Body slender, conical, about three times as long as the width, tapering 

 posteriorly. Anterior border slightly everted. Ciliary disc cushion-like. 

 Contractile vacuole single. Cuticular surface smooth. Body transparent. 

 Stalk about the length of the body, slender. 



Length of type specimen, 85 microns. (Fig. 51, plate XLV.) 



Vorticella longifilum S. K. 



Solitary. Body slender, about twice as long as broad. Peristome some- 

 what dilated. Cuticular surface smooth. Stalk slender, from ten to 

 twelve times the length of the body. 



Length of type specimen, 53 microns. (Fig. 52, plate XLV.) 



Vorticella campanula Ehr. 



Body quite variable in form, broadly bell-shaped. Anterior margin 

 dilated and slightly everted, sometimes exceeding in width the length of 

 the body. Stalk thick, three to seven times the length of the body. Cuti- 

 cular surface smooth. Eminently social. 



Length of type specimen, 85 microns. (Fig. 59, plate XLV.) 



Vorticella microstoma Ehr. 



Body variable in form, usually ovate or nearly globular, a little longer 

 than broad. Border of peristome narrow and constricted, about one-half 

 the width of the center of the body. Cuticular surface finely striated. 

 Pharynx long. Contractile vacuole single. Stalk slender, from two to six 

 times the length of the body. Solitary. 



Length of type specimen, 55 microns. (Fig. 54, plate XLV.) 



Vorticella utricuhis Stokes. 



Body subpyrifoim, about twice as long as broad. Width of peristome 

 about two-thirds that of the center of the body. Body slightly constricted 

 beneath the peristome border. Peristome border everted. Cuticular sur- 

 face strongly striated transversely. Pedicle two to four times the length 

 of the body. 



Lengths given range from 33 to 40 microns. 



Length of type specimen, 38 microns. (Fig. 61, plate XL VI.) 



Vorticella elongata From. 



Body conical, elongated, between two and three times as long as 

 broad. Posterior extremity tapering to a conical point. Anterior end 

 slightly dilated, with raised peristome border. Ciliary disk somewhat 

 elevated. Cuticular surface transversely striated. Stalk stout, about 

 two and a half times the length of the body. 



Length of type specimen, 95 microns. (Fig. 60, plate XLVI.) 



Vorticella spectabilis S. K. 



Body quite variable in form, conical, elongated, between two and 

 three times as long as broad. Anterior end expanded, peristome everted. 

 Cuticular surface finely straited transversely. Stalk short, from one 

 to three times the length of the body. Contractile vacuole single. Social. 



This species was found in abundance in pond water in large social 

 clusters. 



Length of type specimen, 95 microns. (Fig. 62, plate XLVI.) 



