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XI
Explanation of the Plates.
Pl. i.
Figure i. Duva rosea, natural size.
— 2. A branch of the same animal with its divers ramifications, highly magnified: a) division of the main branch;
b) 4 or 5 branchlets; c) 4 or 5 stalks, bearing each from 5 to 7 polyps.
— 3. A polyp, magnified.
— 4. A longitudinal section of 2 polyps, united at the base, magnified: a) the elliptic oral orifice; b) the oesophagus.
— 5. A longitudinal section of the anterior part of the polyp-body, together with half of the oesophagus, highly
magnified: a) outer epithelium (ectoderm) underneath which is a strip of connective tissue, whence proceeds
a septum; b) longitudinal muscular fibres on the septum, attached to the oesophagus; c) transversal muscular fibres,
also attached to the oesophagus; d) epithelial cells in the upper part of the oesophagus; e) epithelial cells
(entoderm) in the lower part of the oesophagus.
— 6. Transverse section of a branchlet, magnified: a) prolongation of connective tissue (septum); b, b) the two septula,
bearing each two long gastral filaments; c) connective tissue with alimentary canals.
— 7. Transverse section of a trunk, showing the septa and principal canals, natural size.
— 8. Transverse section of a small part of a branchlet, highly magnified: a) a long gastral filament, borne by a septulum;
b) transversal muscular fibres on one side of the septulum; c) longitudinal muscular fibres on the other side; d) the
inner epithel (ectoderm); e) delicate alimentary canals in the connective tissue; f) constricted gastric cavity of a
polyp, filled with epithel. and corresponding to a delicate alimentary canal.
— 9. Nutritive canals in the connective tissue of the septa, magnified.
— 10. Transverse section of the medial part of a polyp, magnified: a) the outer epithel (ectoderm); b) connective tissue;
c) a septum between the wall of the body and the oesophagus; d) the inner epithel (entoderm), investing the
divers chambers.
Pl. II.
Figure I. The outer epithel (ectoderm) of the zoanthodeme of Duva rosea, magnified 650 times, drawn by Camera lucida.
— 2. The inner epithel (entoderm); equally magnified.
— 3. A piece of skin from the lower part of the trunk of Duva rosea, in which are seen the closely-set spicules,
magnified.
Figs. 4, 5, 6, 7, 8. The same spicules, highly magnified.
Figure 9. A piece of skin farther up the trunk of Duva rosea, in which the spicules occur widely separated, magnified.
— 10. A spicule from the coenenchym on the lower part of the trunk in Duva rosea, highly magnified.
— It. Corpuscles of connective tissue in Duva rosea, magnified 850 times, drawn by Camera lucida: a) offshoots con-
taining protoplasma.
— 12. a, b, c, d) spicules from the anterior half of the body of a polyp on Duva rosea, highly magnified.
— 13. Transverse section of a group of polyps on Duva florida, with generative products, magnified.
— 14. A piece of the trunk of Duva florida, together with a main branch and its ramifications, slightly magnified:
a) grooves on the trunk; b) a main branch; c) branchlets, with their ramifications, at the extremities of which the
polyps occur.
— 15. A polyp from Duva florida, magnified: a) suture with the adjoining polyp; b) the series of spicules on the aboral
surface of the tentacles,
— 16. A piece of skin from the lower part of the trunk in Duva florida, showing the spicules placed one upon the other,
magnified.
— 17. a, b, c) the same spicules, highly magnified.
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