STAUUASTRUM. 167 



processes, whose apices are rounded, bearing two small di- 

 verging aculei; end view triangular, sides concave, angles 

 broadly truncate and produced into two processes with a 

 wide, rounded sinus between, a third process from a position 

 somewhat back of the sinus, rising at an angle of about 40 

 ■degrees,. projects between the other two, thus constituting 

 three divergent processes at each of the angles of the triangle. 

 Diameter, including the aculei, 30-38 jx. 



Collected by Ed. Potts in Harvey Lake, near Wilkes-Barre, 

 Pa., where it appeared in numbers. 



The three diverging, aculei-tipped processes at each angle 

 make this form a distinct species. 



