Cryptomonas erosa Ehrenberg 1838, p. 41 

 PI. 95, Fig. 39 



Cells broadly ovate or ellipsoid, with the left hand margin (as 

 seen from the ventral side ) arcuate and more convex than the right; 

 apex almost evenly bilobed, the apical depression deep, the gullet 

 broad, extending about 14 or less the length of the cell; chromato- 

 phores 2 parietal elongate plates, brown (in our specimens), blue- 

 green or reddish; cells 8-16/a in diameter, 15-32//, long. 



In stagnant waters; swamps; tychoplanktonic in small lakes. Mich., 

 Wis. 



Cryptomonas ovata Ehrenberg 1838, p. 41 

 PL 95, Fig. 40 



Cells broadly ellipsoid or ovate, the left hand margin ( as seen from 

 the ventral side) symmetrically convex, the right nearly straight; 

 apex unsymmetrically bilobed, the apical depression broad and 

 shallow, gullet extending about % the length of the cell; chromato- 

 phores 2 elongate parietal plates, brown; cells 5-18/1. in diameter, 

 20-80/i long. 



Euplankter; in lakes and ponds. Mich., Wis. 



f 442 ] 



