52 AET. 8. — I. IKEDA : THEEE NEW AND 



long and is slightly dilated, being suspended on the lateral sides 

 by an inconsiderable number of muscular strands. 



The anal glands {a.g.), present in a pair on the sides of 

 the rectum, are long and conspicuous tubular organs, which in 

 large specimens may measure 20 cm. in length. The tube 

 gradually narrows towards the tip. Only in the basal parts the 

 organ is connected to the body-wall and the rectum by a few 

 number of muscular strands ; for the rest, it is entirely free. 

 Over its entire surface are distributed numberless small and short- 

 stalked funnels (fig. 48). 



As before mentioned, the so-called heart (fig. 49, ht.) is sit- 

 uated dorsally on the hind end of pharynx. This anterior posi- 

 tion of the heart constitutes one of the peculiarities of the species. 

 On that account the dorsal vessel {d.v.) is rendered relatively 

 short. The neuro-intestinal vessel {n.i.) arises from the ventral 

 median point of the ring-sinus, which surrounds the extreme hind 

 end of pharynx. 



The genital glands, both male and female, develop, as in 

 many other Echiuroids, from the peritoneum covering the pos- 

 terior parts of the ventral vessel. In the present species, how- 

 ever, they do not form a specialized band lying on and along 

 the ventral vessel, but cover the surface of the latter all around 

 throughout their length. In all the four males and the single 

 female I have obtained, the segmental organs were filled with 

 fully mature reproductive elements of the respective sex. The 

 spermatozoa are of a . relatively large size, with head of an 

 elongate conical shape. The eggs are sjjherical and relatively 

 small in size. 



