36 ART. 5.- — SANn HÔZAWA : 



number. Their basal rays point downwards, while the apical rays 

 project into the gastral cavity. 



Spicules. 



Dermal triradiates (textfig. 7, a, h). — Typically slightly sagittal. 

 Basal ray straight, gradually tapering and sharply pointed, either 

 slightly longer or shorter and a little more slender than the paired 

 rays, 80-190 [j- long and 8-12 /^ thick. The paired rays subequal 

 in length, generally straight excepting a slight curvature near base, 

 sometimes a little crooked, gradually tapering, sharp-pointed, 80- 

 180 A« long and 12-14// thick. 



Subdermal triradiates (textfig. 1 , c, d, e). — Pseudosagittal. All 

 rays of different length and shape. Basal ray longer than the 

 paired rays, straight except being slightly bent near base, gradually 

 sharp-pointed, 280-600,« long and 14-16 /^ thick. The shorter of 

 the paired rays is nearly straight, gradually tapering and sharply 

 pointed, 80-170 // long and 12 // thick. The longer of the paired 

 rays shghtly bent near base, sometimes crooked farther out, gradu- 

 ally and sharply pointed ; they are as thick as the basal ray 

 and in most cases thicker than the shorter of the paired rays, 

 150-280/-/ long and 14-16/^ thick. 



Subgastral triradiates (textfig. 7,/, (j). — Strongly sagittal, with 

 the paired rays very strongly divergent. Basal ray quite straight, 

 and gradually sharp-pointed, 380-880 // long and 12 // thick. Paired 

 rays almost as thick as the basal ray, equal or shghtly differentiated 

 in length, gently curved or crooked, gradually tapering and sharply 

 pointed, 170-220// long and 12/^ thick. 



Gastral quadriradiates (textfig. 7, h, i). — Slender ; facial rays 

 sagittal in most cases. Basal ray generally the longest, quite 

 straight, distinctly tapering in the basal parts but less so in the 



