154 KANSAS UNIVERSITY SCIENCE BULLETIN. 



longed into a proboscis. Pharynx short or lacking; when present re- 

 inforced by a stiff armature. Ciliation sometimes uniform, sometimes 

 restricted to the flattened surface of the body. 



Genus Lionotus Wrzesniowskii. 



Body elongated, widest centrally and tapering somewhat toward each 

 end. Anterior end more or less pointed, usually flattened and proboscis- 

 like. Posterior end sometimes pointed, sometimes bluntly rounded. Body 

 flexible. Peristome long, extending well down the ventral side of the 

 proboscis to the mouth, which is located at the junction of the proboscis 

 with the body and is usually visible. Contractile vesicle sometimes single, 

 sometimes multiple. 

 Lionotus ivrzesniowskii S. K. 



Body elongate lance-shape. Proboscis long, nearly three-fifths the 

 length of entire body, flattened, and slightly dilated at the distal end. Pos- 

 terior region produced into a pointed tail-like prolongation. Cilia fine 

 and short. An oblique row of trichocysts bordering the entire left 

 margin of the neck. Contractile vesicle single, located at the posterior 

 end of the body proper. Macronucleus double, parts spherical and close 

 together in the center of the body proper. Proboscis and tail-like region 

 hyaline. 



Length of type specimen, 155 microns. (Fig. 14, plate XXXV.) 



Lionotus fasciola Ehr. 



Body lancelate, about five or six times as long as broad, widest cen- 

 trally and tapering anteriorly into a short, hyaline proboscis which 

 scarcely equals in length one-half of the entire length of body. Tail-like 

 region short and rounded. Under surface ciliated, upper surface naked. 

 Mouth slightly anterior to the middle of the ventral surface. Trichocysts 

 present along the margin of the proboscis. Contractile vesicle single, 

 located in the posterior part of the body. Macronucleus double, parts 

 spherical and close together in the center of the body proper. 



Found abundantly in pond water and infusions of leaves and hay. 



Sizes given vary from 80 to 120 microns. Size of type specimen, 118 

 microns. (Fig. 15, plate XXXV.) 



Genus Dileptus Dujardin. 



Body greatly elongated, with a long, narrow, flexible proboscis. Mouth 

 located at the junction of the proboscis with the body proper. Pharynx 

 short but conspicuous. Nucleus variable. Numerous contractile vesicles 

 located along the entire dorsal surface of the body. Trichocysts present in 

 the region of the proboscis. 



Dileptus gigas C. & L. 



Body greatly elongated. Proboscis varying greatly in length, flexible, 

 but not very extensible. Pharynx short, conical and longitudinally plicate. 

 Macronucleus variable, sometimes ribbon-like. Contractile vesicles very 

 numerous, extending in a dorsal row along practically the entire length of 

 the body. A single ventral row of trichocysts extends along the proboscis. 

 Cuticular surface longitudinally striated. 



