AOTINOrODOTTS TIOLOTnURIOIDEA. 25 



into cirenlar disks by the union of tlie growtlis from tlio distal 

 ends of the cross-arms (a, />). Pillar single. Tlxere is a marked 

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

 conical or mammae-like basal part, thei'e are, mixed with large 

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

 enlarged and pei'forated like lattice-work (d). Tliese rods form 

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

 supporting rods exactly like those described in the papillae of 

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

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

 not detect any distinct end-plate. Pedicels liavc similar 

 cruciform bodies and supporting rods. They have a well developed 

 end -plate. 



Remarhs : — The principal points which distinguish this species 

 from <S. irlradiaia are : 1) the ventral median zone lias fewer 

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

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

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

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

 tinguislies it from .S. challcngcri or tS. alcxandri. 



T taki> pleasin-e in naming tliis for my friend and former 

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

 Hokkaido. 



