SMITH: INFUSORIA OF KANSAS. 171 



Vorticella convallaria Linn. 



Body elongated, bell-shaped, nearly twice as long as broad. Ante- 

 rior margin slightly dilated, everted. Cuticular surface transversely 

 striated. Stalk short and thick, four to six times the length of the body. 

 Contractile vacuole single. 



Length of type specimen, 130 microns. (Fig. 55, plate XLV.) 



Vorticella pusilla Stokes. 



Body minute, conical, less than twice as long as broad. Width of 

 peristome about equal to the center of the body. Body constricted be- 

 neath the peristome, widest behind this constriction and tapering thence 

 to the posterior end. Stalk four to six times the length of the body. 



Length of type specimens, 18 microns. (Fig. 58, plate XLV.) 



Vorticella aquse-dulcis Stokes. 



Body ovate to pyriform, a little longer than broad. Width of peris- 

 tome a little greater than one-half the width of the center of the body, 

 border thickened. Ciliary disc obliquely elevated. Pedicle two or four 

 times the length of the body. 



Length of type specimen, 35 microns. (Fig. 56, plate XLV.) 



Vorticella similis Stokes. 



Body broadly campanulate, nearly as wide as long, changeable in 

 shape. Body tapering gradually from anterior to posterior end, con- 

 stricted beneath the border of the peristome. Peristome equal in width 

 to the length of the body, its border revolute. Pedicle three to seven 

 times the length of the body. Cuticular surface transversely striated. 



Length of type specimens, 70 microns. (Fig. 57, plate XLV.) 



Genus Charchesium Ehr. 



Zooids similar to Vorticella but forming branched colonies; individ- 

 uals of a colony not differing in size and shape. Central muscle fibre 

 of common pedicle not continuous in the branches but interrupted at 

 the base of each individual stalk, permitting the zooids to contract in- 

 dependently. 



Carchesium polypi) turn Linn. 



Bodies somewhat bell-shaped, peristomal border dilated. Cuticular 

 surface smooth. Pharynx long, curved. Macronucleus bandlike, curved. 

 Contractile vacuole single, located near the pharynx. Common pedicle 

 subdivided. Pedicles of the individual zooids usually springing from the 

 subdivisions. 



This species was found in abundance in stagnant pond water. Many 

 of the colonies are large and beautiful. 



Length of zooids from 50 to 75 microns. (Figs. 69 to 70, plate XLVII.) 



Genus Epistylis Ehr. 



Zooids similar to Vorticella, but forming colonies which are usually 

 dichotomously branched. Individuals usually similar in size and shape. 

 Pedicle treelike, stout, and rigid, with no contractile elements. 



Epistylis plicatilis Ehr. 



Bodies conical, elongated, about three times as long as broad. An- 

 terior margin expanded. Ciliary disc considerably elevated. Cuticular 

 surface smooth. Posterior end conically pointed, forming annular folds 

 5 — Univ. Sci. Bull., Vol. IX, No. 13. 



