THE GEPHYEEA OF JAPAN. 



SIPUNCULOIDEA. 



Genus PHASCOLOSOMA. 

 PHASCOLOSOMA NIGRUM, n. sp. 



(Figs. 1, 25-27). 



This new species (Fig, 1) is of a moderate size, the total 

 length being about 10 cm. The introvert is nearly 2? times as 

 long as the body proper, than which it is slightly narrower. The 

 posterior end of the body is always conically pointed. The body 

 in life is coiled more or less in a spiral-like manner. The 

 greater part of the body is dark gray or bluish-black in color, 

 except the tentacular basis of the introvert where it is light 

 brown. The tentacles, of a clear violet color, are filamentous and 

 very numerous, arranged in 30-32 longitudinal rows. When viewed 

 from above, the oral ends of every set of two tentacular rows are 

 joined by a U-shaped ridge, the mouth being thus surrounded 

 by 15 or 16 of such ridges with radial grooves between. Small 

 skin-bodies are very abundant and are distributed over the entire 

 surface of the introvert and of the body proper. They are largest 

 on the introvert-basis and on the posterior end of the body, in 

 both of which parts they appear as low papillie of 0.1 mm. diameter 

 and 0.05 mm. height (Fig. 25). Each papilla is an elliptical and 

 slightly elevated granular disc of a brownish black color ; in its 



