EDMONDSON — PROTOZOA OF IOWA. 5I 



Reproduction takes place by longitudinal division with great 

 rapidit}'. Two other flagella are first developed from the ante- 

 rior border, then a longitudinal constriction is seen to take place 

 and the two portions of the organism seem to be rapidly drawn 

 apart . 



Widely distributed, everywhere in stagnant water. 



CRYPTOMONAS Ehrenberg. 



Body ovate, with a prominent anterior lip-like process. Fla- 

 gella two in number, nearly equal in length, directed forward, 

 oral aperture at the base of the flagella. Endoplasm containing 

 color bands disposed in a longitudinal manner. Contractile vesi- 

 cle anterior, nucleus near the middle of the body. 



Cryptomonas ovata Ehr. 



In size and appearance, except for the coloring matter, Crypto- 

 monas ovata resembles CJiiloinonas paramcecium . The lip-like pro- 

 cess is very prominent, beneath which is a spacious buccal cavity 

 leading posteriorly into the endoplasm, the oral aperture at times 

 being widely distended. The species as found in this state invar- 

 iably possesses two broad, lateral, chlorophyl bands extending 

 from the posterior to the anterior extremity, one on either side 

 of the body. Its common habitat is fresh water with other chlo- 

 rophyl-bearing flagellates. Widely distributed. 



Eength of body, 50 microns. ' (Fig. 87, PI. XI.) 



Family, CHLAMYDOMONADID^. 



CHIvAMYDOMONAS Ehrenberg. 



Enclosed within a membranous, transparent sheath. Body oval 

 or spherical. Flagella two in number. Endoplasm green with 

 an eye-spot, nucleus, contractile vesicles, chromataphores and 

 starch-like bodies. 



Chlamydomonas sp. (?). 



lyorica transparent, somewhat truncate anteriorly, narrower 

 and rounded posteriorly. Body green, filling little more than 

 half the lorica; flagella two in number, of equal length. A pig- 

 ment-spot usually present. 



lyength of lorica, 12 microns. (Fig. 61, PI. IX.) 



