Art. 9. — M. Yeri and T. Kaburaki : 



in two elongate clusters on each side of 

 the median line ; each cluster divided 

 by the brain into an anterior and a 

 posterior group, the former consisting of 

 more numerous and more crowdedly 

 occurring eye-spots than the latter. 

 Further, numerous marginal eye-spots 

 Textfig. l. Eye-spots of Discoceiis distributed in a horseshoe-shaped tract 



japonica. .. i i i ., ... 



close to the head margin; there existing 

 in the width of that tract commonly two or three eye-spots 

 (textfig. 1). The tract may extend posteriorly on either side to 

 the level of the anterior end of pharyngeal chamber. 



Mouth situated nearly in the centre of body, sometimes even 

 in front of it. Pharyngeal chamber extending nearly throughout 

 the second and third quarters of body-length, supplied with 

 numerous lateral diverticula corresponding to pharyngeal folds. 

 Main gut giving rise to about 12 pairs of lateral intestinal branches; 

 the subbranches not undergoing anastomosis. 



In structural respects of the genital organs, the present species 

 agrees well with Discoceiis tigrina (Blanchard) from Naples. The 

 seminal canals are continuous across the median line near the 

 posterior body-end. From that point they swing forward on each 

 side, diverging all the while up to either the hind end of pharyngeal 

 chamber or near the commencement of the last quarter of the 

 latter. Here they turn abruptly backward and inward, and after 

 running for some distance parallel to their outer limb, pass inward 

 to unite into a single duct, the ejaculatory duct, which runs to the 

 penis without forming a seminal vesicle. The penis is a large 

 blunt snail-foot-like body vertically placed in the anterior parts 

 (antrum musculinum) of the ellipsoid antrum. This opens to the 

 exterior at a distance of about 7 mm. behind the mouth. The 

 prostate is represented by a large number of glands of a prostatic 

 character, found in the walls of penis and of antrum musculinum, 

 quite as in D. tigrina. 



In its hind parts the antrum gives rise to the vaginal canal, 

 which, surrounded by numerous shell glands, pursues a somewhat 



