156 KANSAS UNIVERSITY SCIENCE BULLETIN. 



This species was found but a single time, in water newly brought from 

 a small creek. 



Length of type specimen, 295 microns. (Fig. 7, plate XXXIV.) 



Family Chlamydodontim:. 



Body kidney-shaped or oval. Pharynx distinct, supported by armature 

 of rods or a smooth tube. 



Subfamily Nassulin.*. 

 Ciliation complete. 



Genus Nassula Ehr. 



Body oval or cylindrical, sometimes slightly flattened, ends broadly 

 rounded. Mouth circular, ventrally located in a slight depression and 

 surrounded by larger and more powerful cilia. The remainder of the 

 body uniformly ciliated and longitudinally striated. Pharynx cylindrical, 

 usually dilated at the exterior, and reinforced by an armature, composed 

 generally of rod-like teeth. Anus terminal. Contractile vesicle, single or 

 multiple. Body usually brightly colored. Macronucleus spherical to band- 

 like. Trichocysts present or wanting. 



Nassula aurea Ehr. 



Body elongated, cylindrical. Pharynx armed with rod-like teeth and 

 dilated at the exterior. Macronucleus spherical and located posterior to 

 the center of the body. Trichocysts wanting. A transverge groove present 

 dorsal to mouth region. Contractile vesicle single. Body usually brightly 

 colored with green and reddish brown. 



This species was found twice in water newly taken from a small creek. 



Length of type specimen, 216 microns. (Fig. 17, plate XXXVI.) 



Nassula rubens C. & L. 



Body cylindrical, elongated, ends equally rounded. Pharynx con- 

 spicuous with rod-like teeth, dilated at exterior. Trichocysts abundant. 

 Macronucleus spherical, subcentral. Contractile vacuole single. Body 

 usually reddish-brown in color. 



This species was found but once, in water newly taken from a small 

 creek. 



Length of type specimen, 110 microns. 



Subfamily ChilodontiNjE. 



Body usually flattened ventrally, convex dorsally. Ciliation either con- 

 fined to the ventral side or much stronger than on dorsal side. 



Genus Chilodon Ehr. 



Body compressed, with a flattened ventral surface which is striated 

 and bears cilia. Soft, flexible anterior end bends to the left in a lip-like 

 projection. Posterior end usually rounded. Mouth median or nearly so. 

 Pharynx conical, provided with from ten to sixteen rods. Macronucleus 

 oval, centrally located; one micronucleus. Contractile vesicles varying 

 from one to many. 

 Chilodon cucullus Mull. 



Body elongated oval, about twice as long as broad, rounded posteriorly. 

 Lip-like extension prominent. A groove and a line of stronger cilia lead- 

 ing from the end of this projection to the mouth. Contractile vesicles 



