ACTINOPODOUS HOLOTHUEIOIDEA. 25 



into circular disks by the union of the growths from tlic distal 

 ends of the cross-arms {a, h). Pillar single. There is a marked 

 peculiarity in the supporting rods of the dorsal papillae. In their 

 conical or mammae-like basal part, there are, mixed with large 

 cruciform bodies, very long bent rods, the two ends of wliicli are 

 enlarged and perforated like lattice -work [d). These rods form 

 a very prominent feature. Tliey pass gradually into thorny, bent 

 supporting rods exactly like those described in the papillae of 

 >S. triradiata, underlying the layer of quadriradiate spicules (e). 

 Spicules are very much crowded at the tip of papillae, and I can 

 not detect any distinct end-plate. Pedicels liave similar 

 cruciform bodies and supporting rods. They have a well developed 

 end -plate. 



Remarl's : — The principal points wliich distinguish this species 

 from /S. iriradiata are : 1) the ventral median zone has fewer 

 pedicels ; 2) spicules are nearly all quadriradiate, and very rarely 

 triradiate ; 3) large and peculiar supporting rods, present m the 

 wart-like conical basal parts of dorsal papillae together with tlie 

 cruciform bodies, form a very prominent feature. This also dis- 

 tinguishes it from >S. cli all enger i or S. alexandri. 



I take pleasure in naming this for my friend and former 

 pupil, Mr. S. NozAWA, zoologist to the Fisheries Department of the 

 Hokkaido. 



