ClipArt ETC
"An expanded Alcyonarian zooid, showing the mouth surrounded by eight pinnate tentacles. st, Stomodaeum in the center of the transparent body; m, messenteries; asm, asulcar mesenteries; B, spicules, enlarged." — The Encyclopedia Britannica, 1910

Alcyonarian

"An expanded Alcyonarian zooid, showing the mouth surrounded by eight pinnate tentacles. st, Stomodaeum…

"Transverse section of an Alcyonarian zooid. mm, Mesenteries; mb, muscle banners; sc, sulcus; st, stomodaeum." — The Encyclopedia Britannica, 1910

Alcyonarian

"Transverse section of an Alcyonarian zooid. mm, Mesenteries; mb, muscle banners; sc, sulcus; st, stomodaeum."…

"A, Cerianthus solitarius. B, Transverse section of the stomodaeum, showing the sulculus, sl, and the arrangement of the mesenteries. C, Oral aspect of Arachnactis brachiolata, the larva of Cerianthus, with seven tentacles. D, Transverse section of an older larva. The numerals indicate the order of development of the mesenteries." — The Encyclopedia Britannica, 1910

Cerianthus Solitarius

"A, Cerianthus solitarius. B, Transverse section of the stomodaeum, showing the sulculus, sl, and the…

"The formation of a coral shell (Asteroides). st., Stomodaeum; ms., mesentery; s., calcareous septum; B., basal plate." -Thomson, 1916

Coral Shell

"The formation of a coral shell (Asteroides). st., Stomodaeum; ms., mesentery; s., calcareous septum;…

"A, Edwardsia cliparedii (after A. Andres). Cap, capitulum; sc, scapus; ph, physa. B, Transverse section of the same, showing the arrangement of the mesenteries. s, Sulcus; sl, sulculus. C, Transverse section of Halcampa. d, d, Directive mesenteries; stm stomodaeum." — The Encyclopedia Britannica, 1910

Edwardsia Cliparedii

"A, Edwardsia cliparedii (after A. Andres). Cap, capitulum; sc, scapus; ph, physa. B, Transverse section…

"Portion of epithelium from the tentacle of an Actinian, showing three supporting cells and one sense cell (sc); 2, a enidoblast with enclosed nematocyst from the same specimens; 3 and 3, two forms of gland cell from the stomodaeum; 5a and 5b, epithelio-muscular cells from the tentacle in different states of contraction; 5c, an epithelio-muscular cell from the endoderm, containing a symbiotic zooxanthelia; 6, a ganglion cell from the ectoderm of the peristome." — The Encyclopedia Britannica, 1910

Epithelium

"Portion of epithelium from the tentacle of an Actinian, showing three supporting cells and one sense…

"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…

In this Turbellarian the digestive tract (d.t.) is a blind sac. st., boundary of stomodaeum and mesenteron; c, cilia; g, ganglion (brain); g', ganglion of a new individual which is being formed by fission; o, mouth; o', mouth of new individual in process of formation; w, excretory system.

Stenostoma

In this Turbellarian the digestive tract (d.t.) is a blind sac. st., boundary of stomodaeum and mesenteron;…

"1, Portion of epithelium from the tentacle of an Actinian, showing three supporting cells and one sense cell; 2, a cnidoblast with enclosed nematocyst from the same specimen; 3 and 4, two forms of gland cell from the stomodaeum; 5a, 5b, epithelio-muscular cells from the tentacle in different states of contraction; 5c, an epithelio-muscular cell from the endoderm, containing a symbiotic zooxanthella ; 6, a ganglion cell fro mthe ectoderm of the peristome." —Encyclopedia Britannica, 1910

Tentacles

"1, Portion of epithelium from the tentacle of an Actinian, showing three supporting cells and one sense…

"Transverse section of an Alcyonarian zooid. mm, mesenteries; mb, muscle banners; sc, sulcus; st, stomodaeum." —Encyclopedia Britannica, 1910

Alcyonarian Zooid

"Transverse section of an Alcyonarian zooid. mm, mesenteries; mb, muscle banners; sc, sulcus; st, stomodaeum."…

"Diagrammtic longitudinal section of an Anthozoan zooid. m, Mesentery; t, Tentacles; st, Stomodaeum; sc, Sulcus; r, Rotteken's muscle; s, stoma; lm, Longitudinal muscle; d, diagonal muscle; go, gonads." —Encyclopedia Britannica, 1910

Anthozoan Zooid

"Diagrammtic longitudinal section of an Anthozoan zooid. m, Mesentery; t, Tentacles; st, Stomodaeum;…