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"Echinus gracilis. a, ambulacral plates; b, poriferous zone; c, interambulacral plates." — Encyclopedia Britannica, 1893

Echinus gracilis

"Echinus gracilis. a, ambulacral plates; b, poriferous zone; c, interambulacral plates." — Encyclopedia…

The most remarkable family of the Echinida are the <em>Sea-Eggs</em> or <em>Sea-Urchins</em> - <em>Cidaridae</em>: they consist of several species, somewhat varying in form, some being nearly flat, some oval, some heart-shaped, and some like the <em>Echinus esculentus</em>, resembling an orange in shape." &mdash; Goodrich, 1859

Sea-urchin

The most remarkable family of the Echinida are the Sea-Eggs or Sea-Urchins - Cidaridae:…