r SK RIFT FÖRLILLJEBORG in 



between the two is by moans of the lower cytoplasmic cylinder, the wall of which is seen 

 j n , ■ ,„ to the right of the left nerve ending «. e. The middle floor is very distinct and 



ngly reticulated, but the lower floor at the base of the cell is less distinct than in figures 

 1. 1 and 15. 



Xhi Only two of the nerve endings, in line with the upper surface 



..I the middle cytoplasmic floor, arc visible, the two others probably having been cut away. 



ublimate, alcohols, chloride of gold, acetic acid, bergamot oil, parafine. Zeiss 



Horn. im. Obj. 4. Cross-section of the body of the worm. 



An auditory cell surrounded on one side by a supporting cell and a glandular cell, etc. The section 



perpendicularly to the equatorial of the cell, thus not leaving any trace of supporting 



cells between the cuticle and the upper roof of the cell. On the left side is seen a nerve 



ending in the corner of the auditory cell, while another nerve ending is seen to the left of the 



central cytoplasmic cylinder. Among the cytoplasmic threads forming the upper funnel arc 



a several denser cytoplasmic agglomerations. The reflexed fibres and plates on the top 



of the central cap arc very distinct in this as in figure 7. Several nerve fibres are seen in 



the transverse muscular tissue, also four nerve endings at the base of the glandular cell. 



Corrosive-sublimate, alcohols, ironlakes, hematoxylin after IlEIDENlIAIX, bergamot oil, 

 parafmc. Zeiss 1.?. Horn. im. Obj. 4 also 2 mm. Apochrom. Eyp. S. Cross-section of the body. 

 \n auditory cell surrounded by supporting cells. Section is perpendicular to the cell, the upper 

 roof of the cell and the cuticle are joining. The central cap is connected with the floor 

 only by means of the thin cytoplasmic cylinder, seen in cross-section. Eosin-thionin, same 

 magnification as fig. 8. 

 10. An auditory cell, with unusually large otosome. Eosin-thionin, same magnification as in the 



The section is slightly out of the vertical plane. 

 11 Auditory cell in which the otosome is surrounded by some cytoplasm staining faintly with the 

 n. On one side of the central cap are seen four nerve endings, above the two usu- 

 ally present. Eosin-thionin. Zeiss. Horn. im. 12. Eyp. 3. 



cell, extra vertical section, there being seen the upper part of supporting cells between 



the and the cuticle. The lower cytoplasmic floor is unusually heavy. Eosin-thionin. 



13 Auditory cell in which no otosome could be found. The upper funnel is folded. Eosin-thionin. 



i.) Auditory cell, a very much extra-perpendicular section, the cell has probably been displaced to 



This cell is principally interesting on account of the distinctly lamellatcd lower 

 floor (I. cy.). Eosin-thionin. Longitudinal section of the body. 

 1 he basic part <>f an auditory cell, in which the connection of the two cytoplasmic floors is by 

 means of several reticulated branches of the middle floor. The lower floor is distinctly lamel- 

 1. Longitudinal section. Methylen-blue — congo-red. Zeiss Horn. im. Hyp. 4. The section 

 it quite perpendicular. 

 ■ I central cytoplasmic cap surrounding the nucleus; showing the reticulation of the cyto- 

 plasm. The locus is on the surface of the cap. 

 17 An otosome slightly double. 



