20 ART. 5. — SANJI HÔZAWA : 



No. 23), which was obtained by K. Aoki at Döketsba, Sagami Sea. 

 It represents in the main an irregnlarly cyhndrical sycon person 

 ]:>roken off at one end and wliich has budded out near the 

 damaged end a second, much smaller person. The mother person 

 is slightly laterally compressed and exhibits several small nipple- 

 shaped protuberances on the sides. It measures about 80 mm. 

 long by 10 mm. broad at the widest part, where the wall is about 

 1 mm. thick. The osculum is circular with a diameter of 3J mm ; 

 its margin is very thin and plain without fringe. The second 

 person is cylindrical, circular in cross section, about 20 mm. long, 

 5 mm. broad, and 0.7 mm. in thickness of wall. It shows at the 

 end a small osculum of only J mm. diameter. The dermal surface 

 is quite smooth without any projecting spicules. The gastral sm*- 

 face is lined with quadriradiates, of which the short apical rays 

 project inwards. The gastral cavity is very wide and extends 

 through the entire length of the specimen. The colour of the sponge 

 in alcohol is greyish white. Texture is firm but ratlier brittle. 



Canal system (PI. n., fig. 14). 



The canal system is typically sy conoid. The dermal cortex 

 is fairly thick. The dermal pores, measuring 40-100 /^ across, are 

 thickly distributed over the dermal surface. They lead, either 

 singly or two or three together, into prolonged inhalant canals 

 extending deep into the chamber layer. 



The flagellate chambers are arranged radially with regularity. 

 They are nearly straight, circular in transverse section, distally 

 more or less narrowed, and usually, though not always, undivided. 

 Their distal ends are aU in about the same plane, just beneath 

 the dermal cortex. The position of nucleus in collar ceUs is 

 apical. 



