} 
290 
This seems nearest C. trinodulum Nordst. (De Alg. et Char. r 
pl. 1, fig. 4), but differs in its larger size and the different arrange 
ment of the granules. 
Cos. angulare n. sp., Fig. 14. Length and breadth nearly 
equal. Sinus deep, linear. Semi-cells unequally hexagonal, with 
all the angles but those at the apex thickened or even slightly 
papillate. Sides diverging slightly from the basal angles to near 
middle of semi-cell, then sloping strongly to the truncate ends. 
In vertical view narrowly elliptical, with two papilla near the mid. 
dle and a smaller one at each end. Viewed from the side circular 
with a papilla on each side. Length 30-32 -; diameter 26-30 ; 
thickness 12; isthmus 8-10 4. Type in Herb. Johnson, 280. 
New Baltimore, Mich. 
Staurastrum gyrans n. sp., Fig. 4. Length one-half the 
breadth. Semi-cells subcuneate, top slightly convex; angles pro 
ldnged into slender, slightly incurved rays. Margins of rays Sf 
rate-dentate, apices bearing each three short spines. In vertical 
view 5-radiate; at the base of each’ ray, on the left side, a strong 
horizontal spine. Length 20-25 “; diameter with rays 40-48 ye 
without rays 12. Type in Herb. Johnson, 239. Cold Sprimg 
Harbor, N. Y. 
St. bicoronatum n. sp., Fig. 9. Breadth greater than length. 
Semi-cells subhexagonal, top somewhat rounded; angles pro 
longed, each into a ray with three or four serrations, and pie 
trifid. At base of each ray on the upper side a stout fork ; 
spine. Above and between these two smaller ones below the en 
of the semi-cell. In vertical view triangular, the angles prolonge 
into serrate rays; two forked spines projecting beyond the margin 
on each side, with six smaller ones within the margin, forming . 
circle around the center. Length 14-16“; diameter includes 
rays) 22-25 “; isthmus 6 “. Type in Herb. Johnson, 27% 
Bridgeport, Conn. : 
In form this is somewhat like St. proboscideum (Breb.) Arch. 
forma Javanica Nordst. (De Alg. et Char. 1: p. 11, pl 7 PE: te a 
but it is much smaller, and the processes are not truncate, b 
strongly bifurcate. 
St. elegantissimum n. sp., Fig. 16. Breadth much greater aa 
length. Semi-cells nearly square. Constriction shallow. 
of semi-cell armed with a row of short spines, sometimes eer 
traces of a second ; angles prolonged into slender slightly cu" » 
rays armed with three spines at apex. Rays armed above an 
each side with a row of sharp spiny teeth, several nearest the — : 
bifurcate. In vertical view 4-radiate; within the margin on ¢4° 
side a row of several incurved bifurcate teeth, the tw vO ie 
opposite sides of the ray uniting into a median one neat ae 
