u 
four firm aculei; end view triangular, sides concave, angles broadly 
rounded and furnished with four aculei. Diameter 25//; with aculei 
40-S0M- 
Ponds, Malaga, N. J , and Wilkesbarre, Penn. 
S. ANKYROiDES, n. sp. (Fig. 4.) — About as long as wide, granu- 
larly rough; semicells cylindrical, with enlargement towards the con- 
vex ends; sides produced into narrow, elongate, slightly tapering, 
incurved arms; margins granulate crenate, apices bifurcate; end view 
quadrangular, with angles drawn out into long arms. Diameter 82//. 
Length 75//. 
The only water which hitherto furnished this new species was a 
pond near Malaga, N. J. Var. hexacerum, n^ var. Somewhat 
stouter than the typical form and furnished with six^ instead oi four 
arms. 
This variety I find in northern counties of New Jersey. In the 
possession of six arms it bears n resemblance to St, coronulatiun^ but, 
being nearly twice the length, and without the crown, it appears more 
nearly related to St, a?ikyroides. 
CosMARiuJM SEJUNCTUM, ft. Sp. — Membrane smooth, slightly longer 
than broad; semicells semicircular, with angles rounded, separated by 
a wide, nearly linear sinus; isthmus narrow, less than one-fourth the 
diameter of the cells. Diameter 20-25/^. 
Ocean Beach, etc., N. J. 
MiCRASTERTAS DiCHOTOMA, ^/. j^— Semicells threc-lobed; lateral 
lobes twice bifid; the ultimate lobules (four resulting from one), 
deeply furcate or clawed at their apices; the polar, or end lobe, 
exserted, on a cylindrical neck, with two diverging arms, clawed at 
the ends- Diameter 175-200//. 
Ponds, Malaga, N. J., Harvey Lake, Penn. 
A visit to Brown's Mills, Burlington County, demonstrated how 
the most unpromising fields will sometimes at last reward the perse- 
verance of the patient explorer, for at this place I have hitherto met 
with very poor success. But last August I was rewarded by the discov- 
ery of twelve, new plants, viz.: 
Cosmariianpsetidotoxichondrum^ Nord . 
Staurastrum elongation^ Barker, var. tetragon UM, n. var. (F^g- 
31.) 
S, forficulaiufn, Lund., forma tetragona (Figs. 16 and 17), -^"^ 
forma trigona (Figs. 18 and 19.) 
S. ASPiNOSUM, 71, sp. (Figs. 22 and 23) — Semicells smooth, in front 
view oval with end protracted into a colorless arm, about three times 
as long as the breadth of the body, diverging; apices tricuspidate, 
margins rough with minute, firm perpendicular, irregularly placed, 
aculei. End view triradiate. Spread of arms 58-63A'. 
Brown's Mills, New Jersey. 
The vertical spines, like the thorns of a rose, give this plant a 
distinctive character. 
S. inconspicuum^ Nord. 
Docidium dilatatum^ Cleve. 
D. TRiDENTULUM, «. Sp, — Cells slendcr, elongated, linear or 
slightly tapering, smooth ; semicell with a prominently inflated base; 
