ACTINOrODOUS HOLOTIIUllIOI DEA. 



If 



ono or iiioru nl' llu; anus may Iio branched, tliu hraiicliiiy 

 always talcin.i; placo dieliotoinously. Only very rarely, and 

 then in(_)stly on ambula.cral a|)])endages, there may exist foiir- 

 arraed spicules, the arms being at right angles with one 

 another. From the centre of the triradiato basal disk, there 

 arises a single pillar. The base never shows a. trace oi' four pillars, 

 but the pillar ai'ises as a. single monolith. It hardly tapers at 

 all. Sometimes it becomes slightly thicker toward the upper end. 



Textfig. 2. 



Synal'acle.1 innid'mla : 

 a— Ciilc:ircons ring ; h, c 

 — T,-vl.lp-lil;o bcaics o£ 

 (lorsul pcr.'sjmo; d — fc'iiaie 

 o£ ventral porisome; e — 

 Suiiporting rotl of dorsal 

 papilla ; /, g — Same of 

 ventral pi'ilieels. (h — ij 

 xl(-,0). I— luterradialia; 

 K-i;a,liuIiu. 



At the ujiper end, the {)illar (ei'ininates after lirsf. becoming divided 

 into several points ; or these points may be united by cross-junc- 

 tions, leaving perforations between them. These table-hke deposits 



