ClipArt ETC
"A sewer, a drain. Rome was intersected by numerous sewers, some of which were of an immense size: the most celebrated of them was the cloaca maxima, the construction of which is ascribed to Tarquinius Priscus. It was formed by three tiers of arces, one within the other, the innermost of which is a semicircular vault of 14 feet in diameter. The manner of its construction is shown in the annexed cut. Under the republic, the administration of the sewers was entrusted to the censors; but under the empire, particular officers were appointed for that purpose, called cloacarum curatores, who employed condemned criminals in cleansing and repairing them." — Smith, 1873

Cloaca

"A sewer, a drain. Rome was intersected by numerous sewers, some of which were of an immense size: the…

This diagram shows a sagittal section of a Rotifer. b, brain; bl., excretory bladder; c, cloaca, the common opening of digestive and reproductive organs; co, caelom; e, eyespot; ex, excretory canal; f, flame cells; f.g., foot gland; ft., foot; g, gut; m, mouth; m.f., longitudinal muscle fibres; mx, mastax; o, ovary; pf., pharynx; s.g., salivary gland; t, tentacle; tr, trochus, or cilia-bearing disc.

Rotifer

This diagram shows a sagittal section of a Rotifer. b, brain; bl., excretory bladder; c, cloaca, the…

"Young skate. The yolk-sac has been cut off, the yolk-stalk is left. m., Mouth; ol.o., nostril, e.g. "external gills", a., cloaca; c., claspers." -Thomson, 1916

Young Skate

"Young skate. The yolk-sac has been cut off, the yolk-stalk is left. m., Mouth; ol.o., nostril, e.g.…

"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…