384 i- IJIMA AND T. KUEIMOTO. 



the portion containing older eggs. 



An esfof, with brown «hell and taken fn^m the uterus near its 

 external opening, is represented in fig. 9. In alcohol the shell is 

 collapsed but soon returns to its proper form by leaving it a while in 

 water. It is rather thick. The general form is oval, 0.063 mm. long 

 and 0.048-0.05 mm. broad. The diameter of the operculum measures 

 about 0.02 mm. The contents are oil-globules and a morula-like mass 

 of finely granular spheres, evidently cleavage-spheres. — 



With regard to other points in the structure of the present Botli- 

 rioceplialus species, we have made but casual ol)servations. The 

 main longitudinal nerve runs outside the series of uteri, on each side 

 of the body (///., fig. 8). It lies nearer to the uteri than to the body- 

 margin of the same side. A short distance inside of the longitudinal 

 nerve, the main trunk of the excretory vessels finds its course on both 

 sides. Sections of excretory vessels were sometimes also n.et with at 

 other places. The muscular system is essentially the same as in 

 Bollirioccplhilus laliLs. Finally, we ought to mention that nowhere 

 in our samj)les have we found a single calcareous body in the mesen- 

 chyma. 



