164 DESIIIDS OF THE UNITED STATES. 



Var. EissiMSiENSE, WoUe. Plate XLYII, figs. 1, 2, 3. 



Front, lateral and vertical views; a large, smooth and 

 beautiful form fully one-half larger than the original type 

 from 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. Eloiseanum, Wolle. Plate LII, figs. 17, 18. 



Small, equal in length and breadth, smooth or finely punc- 

 tate; sinus an acute angle; semi- cells subhexagonal, basal 

 and superior angles produced into short, bifurcate processes; 

 sometimes two, but oftener only one discernible at each 

 angle ; end view circular, margin furnished with (usually) 

 nine, short processes, ends notched. 

 Diameter 22-30 n. 



This form has some resemblance to St. spinosum, Breb., but 

 m front view the processes are less conspicuous, the apices less 

 distended ; in end view, circular, not triangular. 



St. ToHOPEKAiiGENSE, Wollc. Plate XLYII, figs. 4, 5. 



Cells 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 pi. 



This species occurs frequently in small coves of Lake 

 Tohopekaliga, at Kissimme, Florida. It bears features in 

 common with Sl.furcatum, Breb., but is about twice the size, 

 has more arms, and has them differently arranged ; the de- 

 scription "one spine at each angle, with two accessory spines 

 at the base," or ".three spines at each angle," does not apply. 



St. DUPLEX, Wolle. Plate LXIV, figs. 6, 7. 



Small, subquadrangular, constriction deep, sinus acute- 

 angled ; semi-cell twice as broad as long, rectangular ; angles 

 truncate and furnished with two short, stout processes with 

 ends truncate granulate-spinous ; end view triangular, sides 

 straight or concave, angles truncate, divided and drawn out 

 into two short, somewhat diverging processes, apices finely 

 toothed. 



Diameter 20-25 M. 



