50 DAVENPORT ACADEMY OF SCIENCES. 



referred to this genus, but the specific identification is uncertain, 

 largely due to an incomplete study of the organism. 



The oval body, narrower at the anterior extremity, was thickly 

 clothed with long, apparently rigid, hair-like setae. In general 

 appearances the form resembled Mallomonas Plosslii Perty. A 

 magnification of five hundred diameters, however, did not reveal 

 the crenulation of the surface which is a character of the last 

 named species. Whether the long flagellum, directed in advance, 

 possessed the retractile power or not I cannot state. One or more 

 contractile vesicles were evident but the nucleus could not be 

 distinguished. 



Movement, rapid in a direct course. Color, yellowish brown. 

 Habitat, pond water. 



According to Kent the rigid hair-like structures which cover 

 the 'surface are attached to the hardened cuticle and have no 

 direct connection with the inner endoplasm. 



I,ength of the body as observed, 15-30 microns. 



Family, CRYPTOMONADID^. 



CHILOMONAS Stein. 



Elongate-oval, anterior border with a projecting upper-lip. 

 Flagella two in number, nearly equal, both directed in advance. 

 Oral aperture on the anterior border near the base of the flagella. 



ChILOMONAS PARAMECIUM Ehr. 



Body elongate-oval in shape, usually rounded posteriorly, ante- 

 rior margin with a prominent lip-like projection. Flagella two 

 in number, sub-equal in length, arising from the lip-like exten- 

 sion, both directed forward, oral opening near the base of the fla- 

 gella. Nucleus central, contractile vesicle anterior. Endoplasm 

 usually enclosing dark-colored corpuscles. 



Length of body, 25-40 microns. (Fig. 86, PI. XI.) 

 Chilomonas paramcecinm is one of the most common flagellates 

 of stagnant infusions. The flagella are delicate and difficult to 

 see during the activity of the organism. The lower one being 

 slightly shorter is often thrown into a coil and serves as an anchor 

 to temporarily attach the organism to some support. In pro- 

 gression the animal takes a zigzag, roving course, rolling on its 

 longitudinal axis. 



