Section of epidermis of coenosare.

PLATE 3.

Fig. 22. Section through the coenosarc to show cords of interstitial X 67.

cells.

Fig. 23.

Fig. 24.
Fig. 25.
Fig. 26.
distribution of supporting fibers and of nettle batteries.

Ectoderm of coenosarc in the region shown in Figure 26.
Section of decalcified spicule, showing spicule-producing cells.
Outline of portion of coenosare between polyps, to show the

X 67.

Fig. 27.

Section to show mesogloea.

Fig. 28.

Section showing mesogloea cells.

X 400.

Fig. 29.

Section of "a cord" in mesogloea of coenosarc.

Fig. 30.

Longitudinal section of epithelium (ectodermal) lining the stomodaeum and of mesogloea.

Fig. 31. Longitudinal section of the wall of stomodaeum, showing both ectoderm and mesogloea.

Fig. 32.

Fig. 33.

Transverse section of a part of siphonoglyph.
Transverse section of a portion of a mesentery.