62 



I. IJIMA : HEXACTINELLIDA. I. 



of the list appended below) may have already acquired the 

 cornucopia-like shape when not much over a foot in height. 

 The variation evidently stands in relation to that of maximum 

 size, which different individuals are destined to attain. 



The following are dimensions of several specimens which T 

 have measured : 



The thickness of the body-wall, exclusive of the parietal 

 ledges or protuberances, does not exceed 2-372 mm. 



The diameter at the extreme lower end of the skeletal tube, 

 inclosed in the basal tuft, is only about one-fifth of that at the 

 upper end. 



