loO DES^fIDS OF THE UNITED STATES. 



St. grallatoeium, Nord. Plate LV. fig. 19. 



Semi-cells subquadrangular, top somewhat produced with 

 one, or two, small acalei at each angle; inferior angles 

 rounded; sides produced, each into a long, thin, colorless 

 ray, margins crenate-dentate, apex bi-tri-furcate ; vertical 

 view oval, produced on opposite sides into a long thin arm. 



Diameter 100-125 n. 



Var. UNGULATUM, Wolle. Plate LV, figs. 17, 18. 



Besides having the apices of the rays tipped with a single 

 claw-like spine, they are usually shorter and stouter, varying 

 as the figures. 



This variety is from Florida ; the typical forms from Den- 

 mark Pond, Passaic Co., JN"ew Jersey. 



St. fusifoeme, Wolle. Plate LV, figs. 20, 21. 



Semi-cells in front view, narrow fusiform, lateral angles 

 drawn out into long, colorless arms, margins crenate-dentate, 

 apices bifurcate ; back or end broadly rounded or straight, 

 crenate ; end view fusiform. 



Diameter 125-138 /<. ; length 38 fx. 



This species appears to be related to the preceding two, but 

 varies from both in form of cell ; from jS'if. leptocladum, in the 

 longer, stouter, and straighter arm^s, and from. St. gratlatorium, 

 in the absence of the produced back and the aculei. 



Denmark Pond, New Jersey. 



St. iotanum,_ Wolle. Plate LXII, figs. 5-7. 



Very minute ; semi-cells quadrangular, angles drawn out 

 into thin, diverging, granular rays, each about as long as the 

 diameter of the body ; apices obtuse ; end view triradiate. 



Diameter, including the rays, 15-20 /<. 



The rays are so minute, they appear like a single series of 

 fine granules. 



Found this very small species quite numerous at Ocean 

 Beach and at Malaga, >'. J. 



St. ankykoides, Wolle. Plate LXII, fig. 4 and variety fig. 3. 



About as long as wide, granularly rough; semi-cells cylin- 

 drical with enlargement towards the convex end ; sides pro- 

 duced laterally into narrow, elongate, slightly tapering, in- 

 curved arms, margins granulate-crenate, apices bifurcate ; 

 end view quadrangular, four-rayed. 



Diameter 82 yU. ; length 75 /i. 



The only water which hitherto furnished this new species, 

 is a pond near Malaga, New Jersey. 



