14() DB8MIDS OF THE UNITED STATES. 



St. Brasiliense, Nord. Plate XLVIII, figs. 1, 2, 3. 



Semicells short cuneate, top truncate or moderately rounded, 

 angles terminating in three firm, diverging aculei ; end view 

 pentangular ; each angle produced into three more or less 

 elongated firm subulate diverging spines, sides concave ; mem- 

 brane punctate. 



Diameter 87-130 a. including the spines. 



Three localities only have been developed for this species ; 

 Florida furnishes the smaller form figured ; the other is from 

 pond, Passaic County, New Jersey, and from vicinity of 

 Mobile, Alabama. The original form from Brazil, is described 

 by the author as usually quadrangular, and angles often 

 furnished with four spines. 



Section IV. (Jells furnished with numerous processes usually divided at the 

 ends. 



St. fuecigebum, Breb. Plate XLVIII, figs. 12-14. Plate LI1, 

 figs. 23, -2\. 



('ells ( stricted at the middle, angular, with six processes 



to each semicell ; in end view, triangular, one process at each 

 angle and one within the angle, about half way between it 

 and the centre of the triangle, Plate XLVIII, fig. 12, 

 Plate LII, fig. 2 1; semicell in front view somewhat elliptic, 

 Plate XLVIII, fig. l-'J, Plate LII, fig. 2:; ; each end drawn 

 out into a short process, margin- serrate, ends furcate or 

 toothed ; three other processes are usually in view, two on the 

 end margin, and one intermediate. Cytioderm granular; 

 granules arranged in transverse lines. 



Diameter 50-62 <i. 



Occurs in many localities, Rhode Island and southward to 

 South Carolina and Florida. 



Foreign authors report a form, quadrangular in end view ; 

 such would have eight processes to a semicell. 



I find considerable diversity in the specimens of this species, 

 particularly in the arrangement of the processes on the tops 

 or ends of the cells ; typically they are attached away from 

 the centre, and are directed towards the angles ; a variety 

 (Plate XLVIII. fig. 14,) has them coming from the centre 

 and directed transversely, or at right angles with the sides. 



