002 Proceedings of the Royal Irish Academy. 



they occur irregularly over the coenenchyma. The verrucae, when expanded, 

 are cylindrical, and either stand perpendicularly or are inclined upwards to 

 the stem ; when contracted they are low and dome-like. The spicules are 

 very minute, and are distinctly prickly in appearance (fig. 23). The following 

 types may be distinguished : — 



(a) Slender clubs, with a distinct smooth middle portion, surmounted by 

 a spiny head, only slightly thicker than the constriction. 



(6j Slicrt, stum])!/ clnls, much broader in proportion to their length, and 

 with the spines slightly more divaricate. 



[c] Double wheels, with an elongated hub. 



{<!) Elongated forms, with a distinct smooth constriction, which may be 

 conveniently termed double spindhs. 



(e) Occasional qiuidriradiatcs. 



(/) Needles in the anthocodiae. 



The following may be taken as typical measurements in millimetres as 

 they occur in all the specimens so far known : — 



(«) 



0076 



X 0'031 constriction 



0008 X 0008. 





0065 



X 0031 





0011 X 0008. 





0065 



X 0023 





0008 X 0-008. 



(h) 



0053 



X 00.34 





0-008 X 0-009. 





0053 



X 0031 





0-011 X 0-008. 





0049 



X 0031 





0-008 X 0-008. 



(c) 



0057 



X 0027 





0011 X 0008. 





0051 



X 0027 





0-011 X 0-009. 





0046 



X 0027 





0-008 X 0-008. 



{d) 



0076 



X 0027 





0-011 X 0-008. 





0068 



X 0027 





0-011 X 0-011. 





0061 



X 0031 





0-008 X 0-008. 



(') 



0038 



X 0034 







(/) 



01 X 



004, 006 X 



004 





Colour-schemes — Brown throughout. 

 Vermilion-red. 







Orange-red, with tips of the verrucae yellow. 

 Pale brick-red. 



Localities. — '. 



Hyaloneina-ground, 

 Andamans, 120 fms. 

 Andamans, 

 Andamans, „ 



ofif Japan, 345 fms. (Wriglit and Studer). 

 (Thomson and Henderson). 

 (Thomson and Simpson), 

 (as stated above). 



