ON SOME JAPANESE CALCAREOUS SPONGES. 23 



and 28-40 /^ thick. Paired rays strongly diverging, almost of equal 

 length, gradually tapering, sharply pointed, curved, lying in a 

 plane different fi'om that of basal ray, 140-300 ^ long and 24-30 /^ 

 thick. 



Gastral triradiates (textfig. 4, h, i,j). — All rays are of nearly 

 equal thickness. Basal ray quite straight, tapering throughout 

 their entire length, sharply pointed, 140-280 /^ long and 12-16 /^ 

 thick. Paired rays nearly equal in length, either straight or 

 slightly curved, gradually and sharply pointed, 130-200 ii long and 

 12-16 /i thick. 



Gastral quadriradiates (textfig. 4, Ä-, /). — Facial rays are exactly 

 similar to gastral triradiates. Apical ray poorly developed. Basal 

 ray 90-250/^ long and 12-16 i" thick. Paired rays 70-200,« long 

 and 8-12 /^ thick. Apical ray smooth, slightly curved, sharply 

 pointed, 20-30 ,« long and 12 i« thick. 



Oxea of oscular margin (textfig. 4, m, n). — Quite straight, 

 spindle-shaped, usually thickest nearer proximal than distal end, 

 tapering towards both sharply pointed ends. The fi'ee projecting 

 ends usually broken off. Some complete examples measured 110- 

 240 /^ long and 3-4 /^ thick. 



Locahty. — Döketsba, Sagami Sea. 



5. Grantessa niitsukurii, u. sp. 



(PI. I., fig. 7 ; PI. n., fig. 15 ; textfig. 5). 



The single specimen (Sei. Coll. Spec. No. 24), representing this 

 new species, is a small colony of irregularly anastomosing tubes, 

 the individuality of which is indicated only by the oscula num- 

 bering six in all. Each osculum is surrounded by a very feebly 

 developed fringe of oxea. The specimen was collected by the late 



