32 AKT. 4. — T. IKEDA : 



body-wall. Very numerous fixing muscles are attached to the 

 intestine. Segmental organs are so long that their posterior 

 ends reach the roots of the retractor muscles ; the anterior one- 

 fifth of their length is fixed to the body-wall by means of 

 mesenteries. Their external opening lies between the 4th and 

 the 5th longitudinal muscle. Eye-spot absent. 



Specimens of this species are frequently obtained in the 

 muddy inlets near the Misaki Marine Laboratory. They are 

 very common along the muddy shores of Tateyama (Province of 

 Böshyü) and of many localities along the Inland Sea. I have had 

 the opportunity of comparing the Japanese specimens with two 

 well preserved specimens of the same species from Naples. In 

 external as well as internal aspects the Japanese specimens agree 

 well with Selenka's description, except in the number of the 

 longitudinal muscles of the body-wall. In the Mediterranean 

 specimens the said muscles are, as was pointed out by Selenka, 

 32 in number, while in the Japanese forms they number con- 

 stantly 30. 



SIPUNCULUS CUMANENSIS, Keferstetn. 



(Fig. 63). 



Selenka, (28), 1884, j). 104. 



The main characters of this species may briefly be stated 

 as follows : 



Body large, elongate ; introvert about one-third of the total 

 length. Skin thick, quite opaque, yellowish or reddish brown in 



