POLYCLAD FLATWORMS — ^HYMAN 



579 



Figure 12. — Nymphozoon bayeri: a, entire anima! drawn from a photograph of the living 

 specimen by Mrs. Patricia Isham; h, anterior central region cleared specimen, showing 

 pharynx and gonopores. (Explanation on page 597.) 



of the row of eight female apparatuses. The sagittal plane of the 

 sections is not very favorable for the study of the male apparatus as 

 this is oriented at an angle to that plane. However, one of them 

 fell in part nearly in the plane of the sections and forms the basis for 

 figure lie. The expanded spermiducal vesicle, containing masses of 

 sperm, enters the proximal end of an elongated seminal vesicle that is 

 bent upon itself. Its proximal half has a thick muscular wall of 



