ArriNoroDOUS holoïhueiuidea. 



21 



ordinary öupportiiig rods in the pedicels of S. iriracUala^ and are 

 arranged parallel to the end-plate. 



Remarl;s : — The arrangement and size of ambulacral appendages 

 are different from those of S. triradiata. Probably the markings 

 too are different. But above all, the spicules of this species are 

 so strikingly different from those of the other known species of 

 Sf/nallactes that I think it must be treated as a new species. 

 The specific name is in reference to the discoidal shape of the 

 base of the tables. 



5. Si/naUactes ishikawai, sp. n. 



(Textfig. 4). 

 Specimens examined : — 



Description : — Body subcylindrical ; dorsal and ventral surfaces 

 distinct, the ventral somewhat flat. When fresh, of a distinct 

 brown tint. On s})ecially contracted parts, wherever there was a 

 mass produced liy contraction, that part had a deep brown color. 

 At present, the color is gone, except from the tips of papillae 

 whicli remain brown, and the whole body has a dirty white 

 color and a cartilage -like aspect. 



Dorsal })a2jillae in six rows, there being two rows on each 

 of the two dorsal ambulacra. Tlie papillae in these two rows 

 stand generally opposite one another at nearly equal distances, so 

 that they form very regular series or lines of papillae from the 

 front backward. There are about 28 — 40 papillae in each row. 



