SMITH : INFUSORIA OF KANSAS. 163 



Stentor roeselii Ehr. 



Body large, soft, and transparent; highly elastic. When fully ex- 

 panded, anterior end rarely measures one-fourth the total length. Some- 

 times secreting a ti-ansparent mucilaginous sheath. Cuticular surface 

 striated and finely ciliated, often bearing slender setae which project 

 rigidly at right angles to the body. Fine, short setae developed on ad- 

 hesive posterior end. Macronucleus elongated, usually band-like. 



Sizes range from 500 to 1044 microns. Length of type specimen ex- 

 panded 675 microns. 



Found in stagnant pond water. 



The species here pictured agrees entirely with Stentor roeselii, but 

 has not been found inhabiting a mucilaginous sheath. (Fig. 34, 

 plate XL.) 



Stentor cseruleus Ehr. 



Body very large and bulky. Color more or less intensely blue. Mus- 

 cular striae conspicuous. Cilia of the general surface fine, with oc- 

 casional long, slender setae, which are not conspicuous. Macronucleus 

 moniliform. 



This species was found in abundance in stagnant pond water; social. 

 It seems quite evidently to be an extremely large variety of Stentor 

 cseruleus. 



Lengths generally given range from 130 to 300 microns. Length of 

 type specimen unattached, 875 micons. (Figs. 37 and 38, plate XLI.) 



Stentor polymorphus, Mull, which differ from Stentor cseruleus chiefly 

 in being intensely green, was observed but not drawn. 



Suborder Oligotrichina. 



Heterotricha having the cilia limited to certain areas. 



Family Halteriid^e. 



Cilia limited to an adoral wreath and sometimes a posterior circle 

 of springing hairs. 



Genus Halteria Duj. 



Body nearly spherical. Mouth eccentric. Adoral wreath of large 

 cilia spiral or subcircular. A zone of long setae or springing-hairs de- 

 veloped in the equatorial region. Body otherwise unciliated. 



Halteria grandinella Mull. 



Body nearly spherical, rounded posteriorly. Adoral wreath form- 

 ing an involution which leads to the mouth. Springing-hairs long, not 

 forming an equatorial girdle. Macronucleus spherical or oval. Con- 

 tractile vacuole single. 



A very common species, found in pond water and vegetable infusions. 

 Size ranges from 16 to 50 microns. (Fig. 36, plate XLI.) 



Order Hypotricha. 



Ciliata having the cilia limited to the ventral surface. Body usually 

 flattened dorsoventrally. 



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



