123 



The calicular space that is not included within the six deltas 

 bas the forrn of a beautifully-regular six-rayecl star, each ray of 

 which is longitudiually bisected by a primary septum. 



The colurnella is a stout vertical plate, the free edge of which 

 may be entire or crenate. 



The shallow calicular fossa, the sides of the columella, and 

 the edges of the septa are sometimes studded with coarse granules. 



The diameter of the largest specimen is 15 millim. 



From S. complicata Moseley this species is at first sight distin- 

 guished by the predominance of the outermost quinaries of each 

 system , and from S. implexa Dennant by the stout laminar co- 

 lumella. 



