162 ART. 7. 1. IJIMA : HEXACTINELLIDA, IV. 



indicated, being in fact quite abortive. Number of terminals to 

 each principal, generally 2 ; seldom 3 and sometimes only 1 to 

 some of the principals. Insignificant microtubercles are sometimes 

 seen on the surface of terminals, at the base of which they are 

 reverted barb-like. 



Discoctaster (PL X., fig. 19), common in all parts ; varying in 

 size. Diameter, 136-220/'-. Central node, always with the six 

 boss-like prominences. Secondary principal, about as long as, or 

 longer than, the terminal tuft. The latter consists of G-8, fine 

 terminals (drawn too thick in the figure) ; narrow at base and 

 expanding more or less distally. Terminal disc, small and 

 pinhead-like. 



Microdiscohexaster (PI. X., fig. 22), very sparsely present, 

 having been found in canalar septa only in a few instances after 

 a careful search ; spherical, with 30-35 !'■ diameter. Central node, 

 swollen to spherical shape. Principals moderately long, with 

 numerous fine terminals. 



STAUROCALYPTUS It. 

 Ijima, '97, p. 53. 



Hypodermalia include pentactins in which the 

 paratangentials are smooth or rough, but never armed 

 with spines. Generally veiled, sometimes not. 



