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"Diagrammatic vertical section through disc and base of one of the arms of Antedon rosacea. The section is inter-radial on the left, radial on the right. t., Ciliated openings in body wall; h., sub-epithelial ambulacral nerve; l., water-vascular canal; k., tentacle; r., mouth; s., intestine; g., central plexus, with "chambered organ" at its base; f., coelom; R1.-R3., radial plates; Br., brachial plates; u., muscle; a., axial nerve-cord; d., central capsule; C.D., centro-dorsal plate; p., cirri; e., nerve branches from central capsule to cirri." -Thomson, 1916

A. Rosacea Arm

"Diagrammatic vertical section through disc and base of one of the arms of Antedon rosacea. The section…

Transverse section of a bronchus. Labels: e, Epithelium (ciliated); immediately beneath it is the mucous membrane or internal fibrous layer, of varying thickness; m, muscular layer; s, m, submucous tissue; f, fibrous tissue; c, cartilage enclosed within the layers of fibrous tissue; g, mucous gland.

Section of the Bronchus

Transverse section of a bronchus. Labels: e, Epithelium (ciliated); immediately beneath it is the mucous…

Cells from the olfactory region of the rabbit. Labels: st, supporting cells; r, r', varieties of rod-cells; f, ciliated cell; s, cilia-like process; b, cells from Bowman's gland.

Cells from the Olfactory Region of a Rabbit

Cells from the olfactory region of the rabbit. Labels: st, supporting cells; r, r', varieties of rod-cells;…

"A ciliated epithelium cell." — Encyclopedia Britannica, 1893

Epithelium

"A ciliated epithelium cell." — Encyclopedia Britannica, 1893

"A ciliated cell with one large cilium." — Encyclopedia Britannica, 1893

Epithelium

"A ciliated cell with one large cilium." — Encyclopedia Britannica, 1893

"Sense-epithelium cell of Aurelia." — Encyclopedia Britannica, 1893

Epithelium

"Sense-epithelium cell of Aurelia." — Encyclopedia Britannica, 1893

Ciliary epithelium of the human trachea. Labels: a, layer of longitudinally arranged elastic fibers; b, basement membrane; c, deepest cells, circular in form; d, intermediate elongated cells; e, outermost layer of cells fully developed and bearing cilia.

Ciliary Epithelium

Ciliary epithelium of the human trachea. Labels: a, layer of longitudinally arranged elastic fibers;…