102 ART. 1. — I. IJIMA : HEXACTINELLIDA, III. 



attracted my attention. The cup-like or tliimble-like chambers 

 measure 65-100 />« in diameter. In a certain specimen an unusually 

 large quantity of yellow, refractive, fat-like spherules were observed 

 hanging on the subdermal trabecuhie (see fig. 22). In all prob- 

 ability they were products of the thesocytes. 



Spiculation. 



The pa}'enchymalia are predominantly slender diactins, ar- 

 ranged in loose bundles or running singly in indefinite directions. 

 They are generally under 1.5 mm. in length and 27/'- in breadth 

 in the middle ; occasionally, somewhat longer than 2 mm. and 

 35 /^- broad. The center is commonly even-surfaced ; occasionally 

 supplied with an annular swelling or with four knobs. The rays 

 generally taper towards the end, which is conically pointed and 

 subterminally rough-snrfaced. 



Included here and there among the parenchymalia are 

 oxyhexactins of medium and small dimensions. In the character 

 of rays these oxyhexactins are exactly comparable to the pent- 

 actinic hypodermalia, except that they are generally somewhat 

 less strong. Axial length, mostly under 700/^-; breadth of rays 

 near the center, 15 /^- and under. The smaller parenchymal 

 oxhexactins seem to pass over gradationally into the canalar 

 oxyhexactins. 



Exceptienally the parenchymalia are tauactinic and staurac- 

 tinic. These forms are especially met with directly beneath the 

 gastral layer and also along the canalar (both incurrent and 

 excurrent) surfaces. 



