6 4 



I. IKEDA : 



funnels (Fig. 3, fu) are thickly clustered like a bouquet around the 

 tertiary branches ; it often occurs that the tertiaries give rise to a few 

 short quarteries, to which 2-5 funnels are attached (Fig. 3). Generally 

 those funnels (f/i) directly attached to the apices of canal branches 

 are the largest. Some long secondaries as well as all the main canals arc 

 fixed to the integument by long but slender muscle-strands (Figs. 2 

 and 3, fm). 



The vascular system docs not show any remarkable feature, and 

 is of the same structural type as that of Hamingia ar etica or of the genera 

 T/ialassema and Boncllia. At a spot about 1 5 mm behind the pharynx, 

 the ventral vessel (Fig. 4 vv) gives off a short branch (niv), the neu- 

 rointestinal vessel. This vessel, about 15 mm long, attaches itself to 

 the beginning of the mid-gut, about 5 mm apart from the anterior 

 boundary of the collateral intestine (ci). The vessel is then divided 

 into two short branches embracing the collateral intestine. It is quite 

 peculiar that these two vessels on the mid-gut and a short length of 

 the neurointestinal vessel (near the intestine), are provided with num- 

 erous, short, villus-like processes (vp). It seems very probable that 

 these structures are of the same nature as the contractile villi of the 

 dorsal vessel found in the Sipunculids. The so-called heart is in this 

 species indistinct. The dorsal vessel (civ) arises from the terminal part 

 of the fore-gut (about 5 mm in front of the anterior boundary of 

 the collateral intestine), and proceeds forwards along the mid-dorsal line 

 of, and finally attaches to, the pharynx. 



The ovary (or) is found along the posterior three-fifths of the 

 ventral vessel (Fig. 2). There the vasculo-peritoneal epithelium is 

 thickly studded with small egg-cells, which are capped with a nutritive 

 cell-mass (Fig. 5). In these ovarian eggs the cellular cap is larger 

 than the egg itself and shows an irregular cocoon-like shape. In the 

 coclomic fluid floats a large number of larger egg-cells still retaining 

 the cellular cap (Fig. 6). This fact and that the oviduct contains no 

 eggs but fully mature males as will be seen farther on, lead us 



