EDMONDSON — PROTOZOA OF IOWA. 49 



NOTOSOLENUS OPOCAMPTUS StokeS. 



Body ovate, the anterior border acutely rounded, the posterior 

 truncate. Flagella two in number, unequal in size and length, 

 the longer projecting obliquely in advance, the shorter trailing. 

 Length of body, 12 microns. (Fig. 82, PI. XI.) 

 Members of this genus may be recognized at once by the oblique 

 manner in which the anterior flagellum is held as the animal 

 moves in a direct course. In Notosolemis opocamphis the shorter 

 and smaller flagellum has its origin on the ventral surface near 

 the base of the anterior one and is directed backward hardly one- 

 half the length of the body. It appears as a minute white line 

 on the background of the body. Frequently found in fresh 

 water among aquatic plants. Its distribution over the state is 

 general. 



Order, PHYTOFI.AGELLIDA. 

 Family, CHRYSOMONADID^. 



NEPHROSELMIS Stein. 



Somewhat oval, ventral border concave. Bright colored pig- 

 ment bands near the periphery. Flagella two in number, of une- 

 qual length. 



NEPHROSELMIS OLivACEA Stein. 



Body rounded dorsally, slightly concave ventrally, pigment 

 bands following the dorsal and lateral contours of the body. 

 Flagella two, unequal in length, arising from the ventral concave 

 surface. Nucleus in posterior region. 



Length, 10 microns. (Fig. 84, PI. XI.) 



This species is a very rare form, having been found in this state 

 but a few times. Its habitat is pond water among aquatic plants. 



MALLOMONAS Perty. 



Body oval, persistent in shape, surface covered with long, rigid 

 setae. Flagellum single, inserted at the anterior extremity. 

 Endoplasm often colored. 



Mallomonas sp. 



Figure 85, Plate XI, illustrates a species which rarely may be 

 found in this state. There is no question but that it must be 



[Proc. D. a, S., Vol. XI. 1 7 [May iS, 1906.] 



