STAT' l:\sTKr_M. 129 



angle produced into a curved horn-like process with end 

 toothed or divided ; granules arranged in transverse lines. 

 Semicells often so twisted a> to make one half appear longer 



than the other half. 

 I >iameter 35 I" ". 



Var. MA.IOK. Wolle. Plate XLUI. Hi-->. 1. 2. 



Not unlike the typical form excepl in size : often attain- to 

 a diameter I "J< '/. 



Var. i'kntaci.am \i. Wolle. Plate XLII, figs. 32-35. 



Separated from the other forms b} the number of arms; 

 they vary greatly in size, always symmetrically arranged with 

 five cun ed .inn-. 

 Diameter I t 85 ,". 



Have one or the other form from every State hitherto 



explored. 



St. paradoxi m. Meyen. Plate XLII. i'il;-. 36, -">7. 



Cells rough with minute granules: fronl view with elon- 

 gated diverging processes which are bifid or tri fid at the apices; 

 end view triangular or quadrangular. 



Dianiet.r h 60 fl. 



I'oiuls, NewYork, Pennsylvania, New Jersey, Massachusetts. 

 The figures represent an extraordinary form ; usually the 

 apices of the processes are inure minutely trifid. 



St. ai:\( iim:. Ralfs. Plate XLII. figs. 38-42. 



Semicells minutely granular, suborbicular, with elongated, 

 slender, often incurved processes ; end view with three to five 

 linear rays : apices obtuse. 

 1 tiameter 10 5< > fi. 



Hahitat same as that of the preceding. Distinguished 

 from it by its more slender arms and ohtuse apices. 



St. comptum, Wolle. Plate XLII, figs. 43-46. 



Small, granulate ; semicells subfusiform, end- convex ; arms 

 more or less converging, separated by an elongated, cylindrical. 

 somewhat swollen isthmus, ribbed in the centre; vertical view 

 six radiate ; ray- straight, tricuspidate at the ends. 



Diameter .'50-40 u.;length 40-50 fi. 



Not rare in pouds, New Jersey. 

 9 



