ON SOME JArANESE CALCAREOUS SPONGES. 9 



is elliptical, G mm. by 3 mm. wide, and leads into the wide and 

 deep gastral cavity. The colour in alcohol is greyish white ; the 

 texture is fairly firm and elastic. 



A second specimen (Sei. Coll. Spec. No. 21) was obtained l)y 

 Prof. Ijima in the Saganii Sea, off Cape Sunosaki, from a depth of 

 429 m. It was attached to the spine of Goniocidaris mikado 

 (Döderlein). The specimen is much smaller than the type, meas- 

 uring 22 mm. in length, 5 mm. in greatest breadth and about 

 0.8 nnn. in thickness of wall. The surface is more strongly hispid 

 than in the type. The osculum is elliptical, oj mm. by 2 mm. 

 wide ; it is in part provided with a distinctly developed oscular 

 fringe. 



The third specimen (Sei. Coll. Spec. No. 22 ; PL 1., fig. 3) was 

 obtained by K. Aoki at the entrance to Enoura, Suruga Bay, from 

 a, depth of 380 m. It was found attached at base on a coral 

 together with a polyzoan colony. It represents an elongate, slightly 

 curved and laterally compressed tube, with the surface thickly 

 beset with projecting oxea. Total length 30 mm. Greatest breadth 

 7 mm. Wall not thicker than 1 mm. The osculum is circular with 

 a, diameter of 3 mm. Oscular fringe is rather distinct. 



The following account refers to the type-specimen. 



Canal system (PI. n., fig. 12). 



The canal system is sy conoid. Dermal pores small, circular 

 or oval with a diameter of 40-150 /^, thickly distributed aU over the 

 surface of sponge ; the pores lead singly, or more frequently several 

 together in groups, into wide inhalant canals through the thin 

 dermal cortex. The inhalant canals extend inwards, around and 

 between the distal ends of flagellate chambers. 



Flagellate chambers are arranged radially with regard to the 



