ClipArt ETC
Diagram showing the Ascon type of sponge. ec., ectoderm; r.c., radiating canals; i.p., internal pores; mes., mesenchyma, e.p., external pores.

Ascon Sponge

Diagram showing the Ascon type of sponge. ec., ectoderm; r.c., radiating canals; i.p., internal pores;…

"A, Longitudinal section through the body of Hydra (diagrammatic). B, small portion of the wall more highly magnified. b, bud; ect., ectoderm; ent., entoderm; f, foot; fl., flagellum; g.v., gastro-vascular cavity; m., mouth; mes., mesenchyma (non-cellular); m.f., muscular processes of the ectodermal cells; n, nettling cells; n', same, exploded; nu., nucleus; t, tentacle; v, vacuole." -Galloway, 1915

Hydra

"A, Longitudinal section through the body of Hydra (diagrammatic). B, small portion of the wall more…

"Diagrams to illustrate the development of one of the simpler types of sponge: I, the egg; 2, section of 16- to 32-celled stage; 3, section of later stage, a ciliated larva (blastula); 4, gastrula; 5, section through older larva which has become attached by the end containing the blastopore. New openings break through by the coalescence and perforation of the ectoderm and entoderm, and and a form results... a, archenteron; bl., blastopore; ec., ectoderm; en., entoderm; mes., mesenchyma; s, segmentation cavity." -Galloway, 1915

Simple Sponge Development

"Diagrams to illustrate the development of one of the simpler types of sponge: I, the egg; 2, section…

"Diagram of simple type of sponge. c, cloaca; ch, chambers, lined with flagellate entoderm; e.p., external pores; i.p., internal pores; mes., mesenchyma; o, osculum; r.c., radiating canals. In the adult sponge the canals and flagellate chambers become much more complex than figured here." — Galloway

Sponge

"Diagram of simple type of sponge. c, cloaca; ch, chambers, lined with flagellate entoderm; e.p., external…

Diagram showing the Sycon type of sponge. ec., ectoderm; r.c., radiating canals; i.p., internal pores; mes., mesenchyma, e.p., external pores; en1, entoderm; en2, flagellate entoderm; f.c., flagellate chambers.

Sycon Sponge

Diagram showing the Sycon type of sponge. ec., ectoderm; r.c., radiating canals; i.p., internal pores;…