452 



TAKU KOMM : 



The ovoid body is slightly compressed, the tentacular axis being 

 a little longer and the pharyngeal axis slightly shorter than half the 

 vertical axis. In large specimens (length over 30 mm.) the body is 

 relatively more slender. The ribs are of equal length, beginning close 

 to the apical sense-organ and terminating below usually a short dis- 

 tance above the level of the oral end of tentacle-basis. The comb- 

 plates are closely set ; in individuals of 20-30 mm. length, they number 

 40-50 in each rib. The perradial intercostal spaces are about equally 

 wide, and somewhat wider than the interradial intercostal spaces. The 

 pharynx is nearly 2/3 as long as the vertical axis. Adradial canals 

 open into meridional canals slightly above the level of the infundibulum. 

 The meridional canals are all of the same length ; they are distinctly 

 longer than the ribs, their oral end nearly reaching the level of the 

 oral end of tentacle-sheaths, or somewhat farther beyond. The tentacle- 

 basis is situated quite close to pharyngeal canals ; it is nearly straight 

 or slightly curved and sometimes even double-curved. The tentacle- 

 sheaths open at a level of between 1/2 and 2/3 the distance from 

 infundibulum to apex ; very rarely they open nearer the former than 

 the latter. The tentacles are long and are provided only with simple 

 filiform branches. The sexual products develop in the entire length of 

 meridional canals excepting a small part at their oral end. 



Colour. — When living, the animal is colourless, only the tentacle- 

 basis being whitish. In preserved specimens, the branches of tentacles 

 are yellowish, due to the presence of colloblasts. 



Specimens examined. — At Misaki, during the interval of Dec. 27, 

 1 9 1 7 and Jan. 9, 191 8, I have examined twelve individuals of 18.5— 

 43 mm. length in the living state. Also the following specimens, all 

 in the preserved state, were at my disposal : One (1. 26 mm.), Misaki, 

 in formalin; three (1. 14.5-30.5 mm.), Misaki, April, 1901, in formalin; 

 six (1. 18-31 mm.), Bonin Islands, Feb.-March, 1894, in alcohol; 

 three (1. 29-43.5 mm.), Tateyama, April, 1909-1912, in formalin. 



Some of the specimens which I obtained at Misaki in the winter 



