NO. 2247. SP0NGE8 FROM NORTHWESTERN PACIFIC— HOZAWA. 



539 



Subgastrial quadriradiates (d) nearly similar to subgastral trira- 

 diates except in the presence of well-developed apical ray. Paired 

 rays sometimes unequal. Apical ray very slender, slightly curved, 

 sharply pointed, about 50/x long and 8[x thick at base. 



Gastral quadriradiates {e) more or less sagittal. Kays nearly 

 equally thick, gradually tapering to sharp point. Basal ray straight, 

 longer than paired rays, 150-240ju, long and 12-16/^ thick at base. 

 Paired rays usually slightly curved and irregular in outline, 110-170ju 



4 



Fig. 5. — Grantia beringiana. a, dermal triradiates. b, tubar triradiates. Cj sub- 

 gastral TRIRADIATE. d, SUBGASTRAL QUADRIRADIATE. 6, GASTRAL QUADRIRADIATE. 

 f, OXEA. g, TRIRADIATE OF OSCULAR MARGIN. h, QUADRIRADIATE OP OSCULAR MARGIN. 

 All X150. 



long and 16/x thick at base. Apical ray fairly well developed, slightly 

 curved in distal parts, 100-210ti. long and 12-16[jl thick at base. 



Large oxea (/) straight, nearly uniformly thick throughout entire 

 length excepting the sharply pointed ends. A small example of the 

 spicule measured 500/* long and 8fx thick ; a large one over Ijn long by 

 12jLi thickness. 



Triradiates of oscular margin (g) strongly sagittal. Basal ray 

 straight, slightly thinner than paired rays, finely pointed, 120-260/« 

 long and 12-16[jl thick at base. Paired rays strongly diverging, 

 sharply pointed, 130-240/x long and 16-20ju, thick at base. 



