EDMONDSON — PROTOZOA OF IOWA. 21 



Cyphoderia ampulla Ivcidy. 



Shell composed of minute hexagonal plates, often punctate, and 

 arranged in oblique rows. Fundus evenly rounded or produced 

 into a conical process. 



Length, i6o microns. (Fig. 35, PI. V.) 



The color of Cyphoderia is usually some shade of yellow or 

 brown, as in Arcella, age being indicated by the density and 

 opaqueness of the shell. 



In some individuals of dark brown color no indications of the 

 hexagonal form of the plates which compose the shell are to be 

 seen. The surface, as in Anella, is curiously ornamented with 

 punctae which are usually arranged with regularity. 



lycidy reports that the pseudopodia are very delicate, branching 

 but not anastomosing. 



The species is exceedingly rare in this state, and no active 

 individuals were among those found. 



Habitat, the ooze at the bottom of rivers, lakes and ponds. 



EUGLYPHA Dujardin. 



Shell chitinous, transparent, composed of plates arranged in 

 longitudinal rows overlapping each other. Usually oblong-oval, 

 circular in transverse sections. Fundus broadly rounded, often 

 bearing spines. Mouth truncating the narrow extremity, with 

 serrated border. Pseudopodia delicate, simple or branched. 



EUGLYPHA ALVEOLATA Duj. 



Shell composed of oval plates overlapping each other and 

 arranged in regular rows producing the appearance of hexagonal 

 areas. Spines often present. 



Length of shell, 100 microns. (Fig. 31, PI. V.) 



Euglypha alveolata is a common Rhizopod, being found almost 

 everywhere in fresh water among algae or in the ooze at the bot- 

 tom of ponds and lakes. 



The spines when present are long, slender and often curved, 

 usually scattered over the surface of the shell. Spineless forms, 

 however, have been much more common in this state than spined 

 ones. Often the demarkation of the plates is indistinct, the shell 

 appearing as a homogenous structure. 



The species is .shy in disposition, active individuals seldom 



