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"Mosaic appearance of epithelium." — Encyclopedia Britannica, 1893

Epithelium

"Mosaic appearance of epithelium." — Encyclopedia Britannica, 1893

"Stratified epithelium." — Encyclopedia Britannica, 1893

Epithelium

"Stratified epithelium." — Encyclopedia Britannica, 1893

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

Epithelium

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

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

Epithelium

"A striated 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

"Modes of forming mesoderm. A and B, special mesoblasts distinguishable early in egmentation (annelid): A, surface view from active pole; B, sectional view of same. ec, micromeres destined to form ectoderm; en, macromeres destined to form entoderm; m, primitive mesoblast which produces the mesoderm. C, amaeboid mesodermal cells (c) budding from entoderm into the segmentation cavity (s.c.), in an Echinoderm. a, archenteron." — Galloway

Mesoderm

"Modes of forming mesoderm. A and B, special mesoblasts distinguishable early in egmentation (annelid):…

"Diagrams of stages in the metamorphosis of Polygordius, a primitive annelid. Ectoderm throughout is represented as nucleated without cell boundaries; the entoderm has the cell-boundaries shown, and the mesoderm is diagonally shaded. A, gastrula; B, same with blastopore closed; C and D represent formation of stomodaeum and proctodaeum from ectoderm; E, Trochosphere stage showing formation of segments in the posterior portion; F, adult (sagittal); G, adult (transverse). a, archenteron; bp., blostopore; br, brain; c, coelom; d, dorsal; di, dissepiments; m, mesenteron; pr., proctodaeum; s.c., segmentation cavity; st, stomodaeum; v.n., ventral nerve chain; z, zone of formation of nerve segments." -Galloway, 1915

Polygordius

"Diagrams of stages in the metamorphosis of Polygordius, a primitive annelid. Ectoderm throughout is…

This diagram represents the vertical section through an arm and an interradis of a starfish. a, anus; amp., ampulla; c.b., circular blood vessel; c.w., circular water canal; co., caelom; co.e., caelomic epithelium; d.b., dermal branchae; e, position of the eyespot; ect., ectoderm; ent, entoderm; f, ambulacral foot; g, ambulacral foot; g, ambulacral groove; h, hepatic caeca or liver; i, insestine; i.c., intestinal caeca; mes, mesoderm; mo., mouth; m.p., madreporic body; n.r., nerve ring; os., ossicles in mesoderm; r.n., radial nerve band; r.b., radial blood vessel; r.p., reproductive pore; r.w., radial water canal; s.c., stone canal; sp., spines; z, lacunar spaces in the mesoderm.

Starfish

This diagram represents the vertical section through an arm and an interradis of a starfish. a, anus;…

"Sections through the unilaminar (A), bilaminar (B), and trilaminar (C) conditions of the typical biastoder. Ect., ectoderm; Ent., entoderm; Mes., mesoderm; c, primitive connective tissue." — Encyclopedia Britannica, 1893

Unilaminar

"Sections through the unilaminar (A), bilaminar (B), and trilaminar (C) conditions of the typical biastoder.…