46 FRESH-WATER ALG^ OF THE UNITED STATES. 



in lateral view arms straight, short ; body puffed out high 

 on each side, crenate on the apices. 



Diameter in front view, including arms, 50-58 yu; thickness 

 of body 20-25 //. 



The front presentation not unlike other forms, but the 

 vertical and lateral view are quite distinct in the unusual 

 inflation of the body. 



The name indicates the habitat. 



ST. CALYXOIDES, Wolle. Plate LVII, figs. 14, 15. 



Nearly equal in length and breadth ; smooth or finely 

 punctate ; deeply constricted ; senii-cells saucer- or calyx- 

 shaped, bearing on the undulate margin five equally distant 

 divergent spines ; end view pentagonal, each angle produced 

 and bearing a strong aculeus. 



Diameter about 33 yw without, and 75 /* with, the aculei. 



Pond, near Manchester, Ocean County, and Green's Lake, 

 Warren County, New Jersey. 



ST. BRASILIENSE, V. Des. U. S. p. 146, var. TRIQUETRUM, 



Wolle. Plate LX, figs. 39, 40. 



The form hitherto found here is pentangular in vertical 

 view ; the form first discovered and described by Nordstedt, 

 is quadrangular, found in Brazil. The present form from 

 California is triangular in vertical view ; it appears so nearly 

 related in character of cell, arrangement and character of 

 aculei, think it best described as a variety of the same 

 species. 



Diameter of cells, including aculei, 63-67 yw. 



Smaller than the pentangular form, but about the same 

 size as the original quadrangular form. 



Collected in small pools near Lake Tahoe, by Mrs. Hanson 

 and Miss Haggin, San Francisco, California. 



