V 



180 HAWAIIAN AND OTHER PACIFIC ECHINI. 



thus is a perfectly distinct plate (PI. 72, fig. £). The madreporic genital is 

 divided into three parts. The anal system is covered with two outer rows of 

 small irregularly shaped polygonal plates, each carrying a small miliary or 

 secondary ; close to the anus the membrane is covered by minute elliptical 

 plates. 



The pedicellarige of this species resemble closely those of Owstoni, but show 

 some interesting differences. 



The dadylous pedicellarite (PI. 64, fig. l) are very scarce and seem to be 

 confined to the actinal side near the ambitus. The stalk is much longer 

 than the head. The three valves are about 1.4 mm. long and completely 

 concealed in the glandular tissue which surrounds them; when cleaned from 

 this organic matter they are found to be very asymmetrical (PI. 64, fig. Jf) ; 

 the blade is greatly compressed for most of its length, but is expanded, with 

 infolded margins, at the tip, and is more or less abruptly bent below this 

 expanded tip. 



The tridentate pedicellariae (PI. 64, fig. 2) are very abundant and vary 

 greatly in size and somewhat in form, though the connecting links are 

 plentiful. The smallest have the valves (PI. 64, fig. 7) about .45 

 mm. long, very blunt, with nearly parallel, straight sides ; the apo- 

 physis continues to some extent into the blade. In the largest, the 

 valves (PI. 64, figs. 5, '6) are two and a half millimeters long, narrow, 

 and more or less closely in contact throughout ; the blade has a very 

 sinuate margin, and on the convex curves the margin is somewhat in- 

 folded and rough, with minute teeth (see fig. 6) ; the blade is filled with a 

 calcareous mesh-work and the apophysis is prolonged as a prominent, serrate 

 ridge. Between these two extremes all sorts and sizes of tridentate pedicel- 

 laria3 may be found. 



The triphf/llous pedicellarice (PI. 64, fig. 3) have very long and slender 

 stalks and rather long necks ; the valves (fig. 8) are about half a millimeter 

 long, and like those of t/ictidis and Owstoni have a very extensive, more or 

 less perforated, cover-plate. The spha}riuia and calcareous spicules are not 

 noteworthy. 



This species is based on a single specimen, 125 mm, in diameter, taken by 

 the " Albatross " at the following station : 



Station 4939. Kagoshima Gulf, Japan ; 31° 18' 30" N., 130° 42' E. 85 

 fathoms. Character and temperature of bottom not recorded. 



