Page:A Text-book of Animal Physiology.djvu/54

Figs. 41 to 46.—In the following figures, ec, denotes ectoderm; en, endoderm; t, tentacle; hp, hypostome; f, foot; ts, testes; ov, ovary; ps, pseudopodium; ec' larger ectoderm-cells; ne' larger nematocysts before rupture; cp, Kleinenberg's fibers; c.l, supporting lamella; cl, chlorophyl-forming bodies; c, cilium
Fig. 41.—The green hydra, at the maximum of contraction and elongation of its body. The creature is represented in the act of seizing a small crustacean (A, 2).
Fig. 42.—Transverse section across the body of a hydra, in the digestive cavity of which a small crustacean is represented.
Fig. 43.—The leading types of thread-cells, after liberation from the body (F, 3). The cells are represented in the active and the resting conditions; in the former all the parts are more distinctly seen in consequence of the necessary eversion.
Fig. 44.—Small portion of a transverse section across the body of a green hydra (D, 3).
Fig. 45.—A large brown hydra bearing at the same time buds produced asexually and sexual organs.
Fig. 46.—Larger cells of the ectoderm isolated. Note the processes of the cells or Kleinenberg's fibers. (F, 3.)
All of the cuts on pages, 9, 11, 13, 16, 18, 21 and 24 have been selected from Howes' "Atlas of Biology."