12 



K. MITSUKUIU 



STUDIES ON 



pedicels and dorsal papillae in longitudinal scries and confined to 

 the ambulacra. On the ventral face, three zones, simple or 

 otherwise, of pedicels. Genital tubes in two bundles (a right and 

 a left). Anus not lodged in a vertical furrow and without any 

 calcareous teeth. Calcareous bodies present in the perisome, 

 of the ground form of a table. The disk consists of three- or 

 four-armed figures, the distal ends of which have a larger or 

 smaller number of perforations, and often laterally send out 

 processes which may nnite with similar processes of other arms 

 and produce open circular lattice-work. The spire consists of a 

 single pillar"-"- which may be divided or perforated, or both, at 

 the upper end. There are supporting rods in the ambulacral 

 appendages. 



3. Synallnctes triradiataf sp. n. 



(Textfig. 2). 

 Specimens examined :— 



* S. reticulalus Sluitek is paid to possess four pillars or knobs, which fact makes it seem 

 doubtful to me whether the species belongs to this genus. 



