MICRASTER1 \-. 1 15 



named it .1/. conferta ; it was so recorded with figure, in his 

 De Desmidiaceis, qua in Sun-in inventa sunt, published 1871, 

 antedating Wood's contribution, by at least one year ; having 

 a priority claim, Lundell's name is preferred. The mem- 

 brane is distinctly and largely punctate, not granulate, except 

 when in old condition. 



M. triangularis, Wolle. Plate XXXVIII, figs. 1,2. 



Cell large, orbicular or oblong; semioells five lobed. 

 Polar 1< l > triangular, apex and sides nearly straight and 

 nearly equal, the angles mucronate. The lateral lobes similar, 

 twice bisected, apices of the lobelets emarginate or furcate. 

 Diameter 170-200 u. 



I found plants recognized as belonging to this new species 

 in three distinct localities; ponds, Broad Mountain, Pa., 

 Ocean Beach and Bamber, N. J., and Florida. They vary 

 somewhat in outline and details of intersections, but all have 

 the same broad more or less triangular terminal lobe with 

 mucronate angles. Fig. 1 is the typical, Pennsylvania form; 

 fig. 2 the Florida type. The New Jersey plant had Btouter 

 terminal lobes, and the ultimate intersections of the lateral 

 lobes were intermediate between the two. 



Ski i h'\ V. i ells oblong. 



M. Jenneri, Kalis. Plate XXX II I. figs. 1, 2. 



Cells oblong, minutely granulated; semioells five parted, 

 lobes closely approximate, cuneate lateral one- obscurely 

 bipartite ; the subdivisions emarginate. 



Diameter 100-150 fx. 



This species differs from all others of this genus in the form 

 of the cell, often twice as long as broad. Fig. 2 is very near 

 a form which Reinsch denominated M. angulosum. It is pro- 

 portionately shorter than the typical form of Ralfs, but other- 

 wise so near, it scarcely admits of separation. 



Section VI. Lobes horizontal, attenuated, bidentate. 



M. laticeps, Xord., 1869. I M. disputata, Wood, 1872). Plate 



XXXVII, figs. 4, 5. 



Quadrangular, about as long as broad, subpinnatisected, 



sinuses acute; terminal lobe nearly as long as the basal lobe; 



both the lobe- strongly attenuated ; the polar lobe into an 



