ClipArt ETC
"Diagrammatic representation of development of Oscarella lobularis. Bl., Free-swimming blastula with flagella; G., gastrula settled down. Next figure shows folding of inner layer (En.); Ec., outer layer. Lowest figure shows radial chambers (R.C.); Mesogloea (Mg.); inhalant pore (P.); exhalant osculum (O.)." -Thomson, 1916

O. Lobularis

"Diagrammatic representation of development of Oscarella lobularis. Bl., Free-swimming blastula with…

"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…