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Echinopaedia is the name for the early or larval stages of echinoderms like sea stars and sea urchins. "A, common primitive form of Echinodermata, whence B, B', a vermiform holothurid, and C, C', a pluteiform ophiurid or echinid (pluteus) larva are derived: a, mouth; b, stomach; c, intestine; d, anus; e, ciliated band." -Whitney, 1911

Echinopaedia

Echinopaedia is the name for the early or larval stages of echinoderms like sea stars and sea urchins.…

"Eupsamma. A genus of perforate stone-corals, as E. brongniartiana (shown here), of the family Eupsammidae." -Whitney, 1911

Eupsamma

"Eupsamma. A genus of perforate stone-corals, as E. brongniartiana (shown here), of the family Eupsammidae."…

<i>Sipunculus nudus</i>. A species of unsegmented marine worm, commonly called the peanut worm. "B, Larval Sipunculus, about one twelfth of an inch long. o, mouth; oe, esophagus; s, caecal gland; i1, intestine with masses of fatty cells; a, anus; w, ciliated groove of intestine; g, brain with two pairs of red eye-spots; n, nervous cord; p, pore; t, t1, so-called testes; W, W, circlet of cilia." &mdash;Whitney, 1889

Peanut Worm - Interior Anatomy of Larva

Sipunculus nudus. A species of unsegmented marine worm, commonly called the peanut worm. "B, Larval…

"Sea-urchin (Echinus esculentus). Left side in natural state; right side with spines removed, showing the bare plates." -Whitney, 1911

European Edible Sea Urchin

"Sea-urchin (Echinus esculentus). Left side in natural state; right side with spines removed, showing…

The wentletrap is a small, white, spiraled gastropod mollusk.

Wentletrap

The wentletrap is a small, white, spiraled gastropod mollusk.