Fig. 44.

Large kind of nematocyst cell, partly exploded.
Large kind of nematocyst cell, unexploded.

Fig. 47.

Fig. 52.

Fig. 53.

Figs. 45, 46. Large kind of nematocyst cell exploded.
Small kind of nematocyst cell.

Figs. 48-51. Interstitial cells containing ovoid bodies.
Desmocyte enveloped in horny matter.

Fig. 54.

Fig. 55.

the column.

Fig. 56.

Fig. 57.
Fig. 58.

cytes.

Fig. 59.

canal.

Fig. 60.

Face view of the striated ends of six desmocytes.
Secreting cells of axis epithelium.

Longitudinal section of endoderm of polyp wall in the region of

Longitudinal section of endoderm of a polyp chamber.
Longitudinal section of the axial skeleton, near the tip of a branch.
Section of a portion of axis with its axis epithelium and desmo-

Longitudinal section through the endoderm of a longitudinal

Epithelium of axial skeleton, with desmocytes.

Fig. 61. Diagram of a longitudinal section of the axial skeleton to show the nature of the skeleton in the region of a branch.

Fig. 62, 63. Cross sections of two dorsal mesenterial filaments.

Fig. 64. Cross section of a ventral mesenterial filament.