20 



K. MITÖUKUKI : STUDIES ON 



Tho tablo-likc calcareous bodies (textfig. oa — c) arc built on 

 the same plan in all parts of the body, although there arc 

 differences in size and elaboration ; 0.09 — 0.23 mm. in diameter. 

 They are all on the same fundamental plan as those of .S. triracUata, 

 but the ends of the arms and their branches arc united with one 

 another by lateral processes, and a disk-shaped base is thus 

 formed. Triradiate ones very few, except at the base of 

 ventral pedicels. Spire of a single pillar, never in the form of 

 columns. Supporting rods scattered among large basal disks of 

 dorsal papillae (d), very long (O.G mm.) ; the two ends have 

 many perforations. These rods are irregularly scattered, and even 

 toward the tip of the papilla, although becoming somewhat 



Textfig. 3. 



Sijtiallactes discoid- 

 (dis : a— c — Tuble- 

 li'.ie bodies; d — Sup- 

 porting rod ûf (lors-al 

 piipillii ; e — Siime o£ 

 pciliccl. 

 (a-r,x24(). d, e.x8ü). 



shorter, they do not become as numerous or simple or twisted as in 

 S. nomtccd or S. iriradlata. Supporting rods in pedicels (c) are Hko 



