Fig. 22. cells.

Fig. 23.

X 67.

PLATE 3.

Section through the coenosare to show cords of interstitial

Section of epidermis of coenosare.

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

Fig. 27.

distribution of supporting fibers and of nettle batteries. X 67.

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 stomodacum and of mesogloea.

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

Fig. 32. Transverse section of a part of siphonoglyph.

Fig. 33.

Transverse section of a portion of a mesentery.