276 I. IJIMA : HEXACÏINELLIDA. I. 



The unpaired ray is usually much longer and more pointed at 

 the end than the paratangentials. 



Of the hexaslers, the floricome (PI. X, figs. 18, 19) is found 

 in abundance in the periphery of the wall, now and then borne 

 on the end of dermal distal rays in the usual way. Diameter 

 100-115//, which size nearly corresponds to that of the same 

 rosette taken from O. Schmidt's type specimen and figured by 

 Schulze in the Challenger Keport. The disc at the end of each 

 principal is convex on the outer side. Terminals 5-8 in a 

 perianth. Terminal disc with 4 or 5, moderately strong teeth 

 on the outer edge ; the inner edge in profile view is indicated 

 by a hump-like bend of the contour-line at that place. 



The graphiocome in an intact state was rarely observed, but 

 the rhaphides detached from it were found in tolerable abun- 

 dance, either scattered singly or still preserving their sheaf-like 

 arrangement. They mostly adhere to the dermalia ; otherwise, 

 they lie about free in the most peripheral region of the wall. 

 Length of rhaphides 95 lu Kelics of the graphiocome, consisting 

 only of its principals with discs at the ends, have been occasion- 

 ally met with. Principals 10 /-« long ; rather slender. Except in 

 a specimen from the Galapagos (F. E. Sch. '99), the graphio- 

 come seems to have hitherto been overlooked. 



The onychasier (PI. X, figs. 20, 21) closely resembles the 

 same of R. Jcomeyamai. It is very abundant, especially in the 

 deeper parts of the wall. Diameter 64-92 /i. The fine, tapering 

 terminals number o or 4, rarely 2 or 5, to each principal. The 

 short, exceedingly line, backwardly arched, terminal claws seem 

 to number o to each terminal ray. They may be easily over- 



