Mallomonas caudata Iwanoff 1899 [1900a], p. 250 

 PI. 97, Fig. 1 



Cells ovoid, much narrower at the posterior end, membrane 

 covered with oval scales so disposed as to form transverse rows; all 

 scales bearing a long needle, the needles directed outward and 

 back; anterior end furnished with a few sharp teeth; chloroplasts 

 2 brown, parietal plates; cells 12-30/x in diameter, 40-85/i, long. 



Rare to common in the plankton of a great variety of lakes. Mich., 



Wis. 



Mallomonas elliptica ( Kisselew ) Conrad, 1933, p. 17 



PL 96, Fig. 24 



Cells broadly elliptical and broadly rounded posteriorly, narrowed 

 anteriorly; membrane covered with diamond-shaped, rhomboidal or 

 polyhedral scales arranged in somewhat irregular transverse rows, 

 the scales without needles; spines not present except for small 

 projections at the anterior end around the flagellum aperture; cells 

 28-30/x in diameter, 47-50/i, long. 



Euplankter, uncommon. Wis. 



Mallomonas fastigata var. macrolepis 



(Conrad) Conrad, 1933, p. 65 



PI. 97, Fig. 2 



Cells pyriform, elongate-elliptic, broadest at the anterior end, 

 narrowV rounded at the posterior pole; scales ovoid to subcircular, 

 overlapping and with no apparent order of arrangement; needles 

 numerous, long, posteriorly directed (described as being barbed 

 near the ends but this not observed in our specimens); 20— 25/x 

 in diameter; 50— 60— (80) /x long. 



Euplankter. Wis. 



Mallomonas producta (Zacharias) Iwanoff 1899 [1900a], p. 250 



PI. 97, Fig. 4 



Cell cylindrical, the lateral walls either straight or slightly convex; 

 membrane covered with diamond-shaped or transversely elongate- 

 elliptic scales so disposed as to form diagonal (spiral) rows; needles 

 produced only in the basal region, posteriorly directed; chromato- 

 phores 2 golden-brown, parietal plates; cells 9-13/i, wide, 40-70/a 

 long. 



Rare to common in the plankton of a variety of lakes. Wis. 



[372] 



