re:\[Arkable species of eciiiuroids. 19 



pit of oval or roundish shape, and from it is protruded, in calm 

 warm wealther, the long proboscis of the worm, while the body 

 proper remains entirely hidden. The proboscis may thus be 

 exposed to a length of one meter or more ; it is usually extended 

 in a nearly straight line and rests flat on the bottom surface 

 with the grooved (that is, the ventral) side facing upward. It 

 then appears like a band of a dirty grayish color and might 

 easily be mistaken for a dead leaf of Zostera. It makes a 

 stretching movement, its free end moving from side to side, as 

 if it were slowly creej)ing on the bottom. When disturbed by 

 a touch with stick, or even when suddenly covered by shadow as 

 it lies extended on the sun-lit bottom, the proboscis is rapidly 

 and entirely withdrawn into the pit-like burrow. 



For obtaining the worms, search was made for the protruded 

 proboscis in such places as will be exposed above water during 

 the low tide. The position was marked by planting bamboo 

 sticks close to the burrow pit. By the time the place was 

 sufficiently out of water, it was revisited and the digging out of 

 the worm was done. In this way I have learned tliat the 

 burrow sinks perpendicularly to a depth of 70-90 cm. into the 

 moderately firm ground. It is tubular and cylindrical, measuring 

 for the most part about 2 cm. in diameter ; near the lower end 

 it is considerably wider, reaching up to 4-5 cm. across. The 

 wall surface of the tube is smooth and bears a rusty reddish color. 



External Characters. 



Having failed to obtain a male specimen for study, all my 

 observations on the external and internal organization of the 

 species are based on the female. 



