32 



ART. 4. — EKITARO NOMURA 



pch 



ol 



— spm 



The spiral muscle fibres are attached to the body wall near 

 the male pore, and are thickly developed at the penial portion. 

 At the proximal end of the penis they are continued into the 

 muscles of the atrium, and at the other end they are attached 

 to the body wall at the posterior part of the segment, near the 

 dorsal seta-bundle. 



It is worthy of 

 note that, in the most 

 posterior part of the 

 penial chamber, the 

 cells of the two lining 

 epithelia are obliquely 

 disposed with . respect 

 to the long axis of the 

 penis, owing to the 

 action of the spiral 

 fibres (fig. 23). 



4). Spermathecas. 

 One pair of sperma- 

 thecse, formed by the 

 invagination of the body 

 wall, are present in seg- 

 ment X. When young 

 the organ is a simple 

 sac with thickened wall, 

 but when fully develop- 

 ed it is somewhat pear-shaped, with a large saccular portion and 

 a somewhat conical efferent duct. 



The external opening lies in front of the ventral seta -bundle, 

 at about the middle of the segment. In most cases the organs 

 of either side undergo a sigmoidal contortion symmetrically with 

 respect to the median line of the body, with the blind end 

 directed anteriorly. In full grown specimens, however, the sac- 

 cular portions are often situated directly under the dorsal median 

 line with the blind ends turned in opposite directions, as shown 

 in fig. 24. 



Fig. 23. 



L. gotoi. Cross section through near the proximal 

 end of the penis. x700. pch — penial chamber, 

 ol— lining epithelium of the penial chamber, spm — 

 spiral muscle, il— inner epithelium of the penis, cs — 

 chitinous sheath. 



