STAURASTRUM. 45 



Minnesota. The arms are similarly constructed and ar- 

 ranged, but in proportion with the body, are much longer, 

 nearly equal in length to the diameter of the body ; apices 

 not notched but tipped with several small spines. 



Diameter, including arms, 100-125 /*. 



Grassy shores of Lake at Kissimme, Florida, March, 1885. 



ST. TOHOPEKALIGENSE, Wolle. Plate LIX, figs. 4, 5. 



Cell smooth, semi-cell in front view oval with radiating 

 arms ; in end view triangular, each angle drawn out into a 

 smooth arm nearly as long as the diameter of the body ; two 

 similar arms on each side ; all at nearly equal distances and 

 bifurcate at the apices. 



Diameter, including arms, 75 /*. 



This species occurs frequently in small coves of Lake 

 Tohopekaliga, at Kissimme, Florida. It bears features in 

 common with St. furcatum, Breb., but is about twice the 

 size, has more arms, and has them differently arranged ; 

 the description " one spine at each angle, with two accessory 

 spines at the base," or "three spines at each angle," does 

 not apply. 



ST. AKCTISCON, Y. Des. TJ. S. p. 148. 



In addition to the forms represented on Plate XL VI I, 

 figs. 9, 10, I add another, apparently more highly developed, 

 Plate LXI1, fig. 4, distinct in the large, wide-spreading 

 points of the trifid apices of the arms. 



Green Lake and other waters of New Jersey. 



ST. PARADOXUM, V. Des. TJ. S. p. 129, var. OSCEOLENSE, 



Wolle. Plate LIX, figs. 8, 9. 



This variety differs from the typical form in its larger 

 size, quadrangular body and in the large trifid, hooked, 

 apices of the arms. 



Diameter of spread of arms 60-70 //. 

 Lake Osceola, Winter Park, Florida. 



ST. MINNEAPOLIENSE, Wolle. Plate LYII, figs. 11-13. 



Small verrucose ; semi- cells in front view subcuneate with 

 the two opposite superior angles drawn out into a short 

 arm with margins serrate, and apices finely toothed ; arms 

 diverging from the arms of the connected s.enii-cell ; in ver- 

 tical view arms straight, body much elevated on each side ; 



