Warp. — Nectonema. 
PLATE II. 
Fig. 12. Tangential section, including cuticula of dorsal line with bristles. 1. C. 
x 180. 
Fig. 13. Cross section of cuticula with bristles attached, only the basal portions 
of which are represented. At the lower side lies a cross section of a 
bristle. 4.C. X 400. 
Fig. 14. Cross section of cuticula with scales attached. Apochr. 4mm. Compens. 
Oc. 4. X 360. 
Fig. 15. Cross section of scale with cuticula and hypoderm. Apochr.4mm. Com- 
pens. Oc. 12. X 1,050. 
Figs. 16,17. Cross sections of scale on cuticula to show central canal. Apochr. 
4mm. Compens. Oc. 4. X 360. 
Figs. 18, 19. Surface view of scales on cuticula. Apochr. 4mm. Compens. Oc. 4. 
x 360. 
Fig. 20. Cross section of cuticula and hypoderm. Ehrlich’s hematoxylin. Apochr. 
4mm. Compens. Oc. 8. X 720. 
Fig. 21. Cross section of body wall just lateval to dorsal line to show structure of 
the muscles. Apochr.4mm. Compens. Oc. 8. xX 720. 
Fig. 22. Fragment of muscle after maceration in 60 % KOH, and subsequent 
treatment with potassic acetate. 38.C. X 3820. 
Figs. 23-26. Cross sections of body wall from different individuals to show the dif- 
ferent widths of the contractile and protoplasmic zones in the mus- 
cular layer. The contractile zone is represented by a dark band, and 
the protoplasmic by a lighter tint. 1A. X 52. 
Fig. 27. Tailed nuclei from muscular layer. Mayer’s HCl carmine. Apochr. 
4mm. Compens. Oc. 8. xX 720. 
Figs. 28-30. Portions from protoplasmic zone of muscular layer, showing the for- 
mation of corpuscles from the free ends of the muscle (?) cells. Gen- 
tian violet and eosin. Apochr.4 mm. Compens. Oc. 4. X 375. 
Fig. 28. Portion of cell nearly cut off at 2. 
Fig. 29. Portion of cell at z, which stains more deeply and resembles corpuscles 
(cp’.) of the body cavity. 
Fig. 80. Corpuscles of different sizes completely separated from protoplasmic 
zone. 
