ART. 4. — EKITAEO NOMURA : 

 A B 



Fig. 2. 



L. gotoi. Diagrams of cross sections of body, showing the j)osition of the seta-bundles. 

 A — anterior segment, B— posteriormost one. 



(fig. 2). " They are present from the second segment and their 

 position in each segment is rather posterior than middle " (Hatai). 

 As already mentioned, the anterior five segments are always 

 biammlate, and in these segments the seta-bundles are borne at 

 the middle of the posterior annulas. Each seta-bundle is always 

 accompanied by one or two young setae and the posterior bundles 

 often consist of young setae only. In segment XI the ventral 

 seta- bundles are absent. 



The setigerous follicle is formed of cells derived from the 

 hypodermis by proliferation, and the initial stages of its develop- 

 ment can be seen at the most posterior part of the body. " The 

 setae first appear as small cones of chitinous substance " (Beddaed) 

 at the bottom of the organ, and as far forward as 2-3 mm. from 

 the hind end of the body, the setae, growing in length and 

 pushing out through the tissues, begin to break through the 

 euticular layer, which is at first lifted up by the growing seta. 



The follicle cells of the full grown anterior setigerous organs 

 undergo a sort of chitinous metamorphosis and present very fine 

 striations parallel to the setae. In the follicular hypodermis there 

 are neither cell-boundaries nor nuclei, the latter having wandered 

 into the follicle and assumed a more or less regular arrangement* 

 In these full grown setigerous organs, both the seta -forming and 

 young follicle cells are observable as parts of the follicular fundus. 

 This part lies at first close to the median plane of the body, but 



