Mallomonas producta var. Marchica Lemmermann 1903d, p. 106 



PL 97, Fig. 5 



Differing from the typical by having shorter and broader cells, 

 with the needles both anterior and posterior; cells 11-12/i, wide, 

 21-26/x long. 



Euplankter. Wis. 



Mallomonas pseudocoronata Prescott 1944, p. 363 

 PI. 96, Fig. 23 



Cells fusiform-elliptic, narrowly rounded at both poles; scales 

 transversely elliptic to rhomboidal or diamond-shaped, not imbricate, 

 arranged in spirally transverse series, at the anterior end forming a 

 corona of sharply pointed projections about the flagellum opening; 

 needles of 2 kinds, stout long ones forming a posterior tuft and 

 short spine-like recurved ones over the surface; cell 20-25^ in 

 diameter, 48-50/x long including needles. 



Euplankter. Wis. 



Mallomonas tonsurata Teiling 1912, p. 277 

 PL 97, Fig. 6 



Cells ellipsoid or ovate, with the posterior end broadly rounded 

 and the anterior end narrowed; membrane covered with irregularly 

 arranged ovoid scales, those in the anterior end bearing a needle; 

 cells ll-12|Li in diameter, 21-26/* long. 



Euplankter. Wis. 



Mallomonas urnaformis Prescott 1944, p. 363 

 PL 97, 'Fig. 7 



Cell elliptic with a corona or neck of erect scales at the anterior 

 end about the flagellum pore, scales of the membrane rectangular, 

 arranged in transverse and longitudinal series, with a few modified 

 scales at the posterior end; needles few, long, slender, and diverging 

 in all directions, evenly scattered; cell 11-14/x in diameter, 25-30^ 

 long ( without needles ) . 



Euplankter. Wis. 



CHRYSOSPHAERELLA Lauterborn 1896, p. 16 



A free-swimming globose colony of ellipsoid or pyriform cells 

 inclosed in a gelatinous envelope in which are embedded many 

 small plates of sihcon; anterior ends of the cells all directed outward, 



[ 373 ] 



