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XVI
Figure 6. Transverse section of the end-bulb of the stalk, viewed from above, slightly magnified: a) transversal septum, and
the membraneous filaments, proceeding therefrom; b) connective tissue with its reticulating meshes.
— 7. A similar section, lateral aspect: a) transversal septum; b) reticulating connective tissue; c) the space under the
free margin of the transversal septum, into which the dorsal and ventral canals open.
— 8. Transverse section of the stalk, magnified: a) connective tissue; b) spicules; c) prolongations of connective tissue;
d) a canal; e) longitudinal muscles on wall of canal; f) a narrow layer of connective tissue; g) circular muscles;
h) entodermic cells.
— 9. Transverse section of a polyp, systematically represented, magnified: a) wall of the body, in which are seen
spicules; b) entodermic cells on the outer wall of the oesophagus; c) in the anterior half of the oesophagian wall;
d) a septum; e) a chamber.
— 10. A fragment of the inner wall of the oesophagus, highly magnified: a) epithel; b) unicellular glands (?).
PI. XIII.
Figure 1. Leptotilum gracile, varietas norvegicum, natural size.
— 2. Same animal, magnified; a) a polyp, with its cell.
— 3. Calcareous skeleton, magnified.
— 4. A polyp with its cell, magnified: a) spicules from the aboral surface of the tentacles.
— 5. Polyps, magnified.
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