15 
apex crowned with a few large teeth, usually three in view. Diameter 
12-13//. 
Ponds, Pleasant Mills, and Browns Mills, N. J. 
Phymatodocis Nordstetianum, «. sp. — (This genus is based on 
plant found in Brazil, in character near the genus Desmidiuni), 
Cells closely united in sheathless filaments; deeply constricted in the 
middle; filaments quadrangular with sides longitudinally excavated. 
The new species, hitherto found only in a pond at Brown's Mills, 
New Jersey, differs from the Brazilian plant in being one-fourth 
smaller, in having the lobes in end view straight, not curved to one 
side, and in having the sinuses of the cells not narrow linear, but 
somewhat enlarged inwardly and rounded at the base. 
Desviidium {Didymoprium) quadratum, Nord. 
_ D. ELONGATUM, n. sp. — Filaments thin; cells in front view nearly 
twice as long as wide; in side view nearly 2.5 times longer than broad; 
closely united, without a thickened border at their junction; end view 
broadly elliptic. Diameter at widest part, 28//, thickness, 16-18R 
This interesting new species from a pond at Brown's Mills, New 
Jersey, was found late in September last. No gelatinous sheath was 
observable. 
Hyaloiheca imdulata, Nord., and Penium Clevei^ Lund. 
Further north, in Passaic County, the ponds known there as 
Wood, Longwood, Green and Buckaberry, furnished many alg^. in- 
cluding a number of desmids. A very interesting plant was Pleura- 
carpus mirabilis. Through nine consecutive seasons I had carefully 
sought for this in fruit, and only came across it, in this my tenth an- 
nual search, in Buckaberry Pond; and, oddly enough, it was found 
about the same time by my friend Miss Butler, of Minneapolis, then 
on a visit at Maiden, Mass. These are, I believe, the only two places 
^vhere it has been detected, although Mr. E. L. Cheeseman, of 
Knowlesville, N, Y., discovered it in his aquarium a year earlier. 
The xi^v^ desmids from these waters are: 
Euastrum abrtiptum^ Nord, 
. E- URN^FORME, ft, Sp, — Semicells urn-shaped, three-lobed; term- 
inal lobe dilated, centrally sinuate; lateral lobes horizontal with sides 
converging, sinuate; basal portion protruding, emarginate; upper part 
broadly rounded; a rounded sinus between it and the end lobe; pro- 
tuberances, one at each angle of the terminal lobe, one at each of 
the basal angles, two intermediate and one between the end and the 
lateral lobes. Diameter 55-60//. 
Wood Lake, Passaic Co., N. J. 
E. COMPACTUM, «. J/.— Very small, suborbicular, slightly longer 
than broad; semicells broad, transversely oval ; apex a slight pro- 
tuberance with a linear incision ; two small prominences, one on each 
side below the apical protuberance. Diameter 20-22//. Length 22//. 
E. OBTUSUM, n. 5/.— Minute, twice as long as wide; semicells 
obovate; base flattened, sides roundly diverging; end broadly rounded, 
v»th a linear central incision. Diameter 14/^- Length 25/i. 
Ponds, Pennsylvania. 1 , u ^ 
MicRASTERiAs NoRDSTETiANA, u. sp,—Oi equal length and 
breadth; semicells three-lobed; the lateral lobes divided mto two sub- 
