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"The species of the genus <em>Clio</em>, belonging to this order, exist in prodigious numbers in the Arctic and Antarctic seas. So great, in fact, is their abundance, that although they do no exceed an inch in length, they furnish a great part of the food of the whale-bone fishes." &mdash; Goodrich, 1859

Clio borealis

"The species of the genus Clio, belonging to this order, exist in prodigious numbers in the…

"Shell-bearing Pteropoda. f, f, fins; l, liver; o, ovary; sh, shell." -Parker, 1900

Pteropoda

"Shell-bearing Pteropoda. f, f, fins; l, liver; o, ovary; sh, shell." -Parker, 1900

Mollusks grouped as opisthobranch gasteropods. Carniverous and found in open water.

Pteropoda

Mollusks grouped as opisthobranch gasteropods. Carniverous and found in open water.

"The shell of the <em>cleodora pymidata</em> is triangular." &mdash; Goodrich, 1859

Cleodora pymidata

"The shell of the cleodora pymidata is triangular." — Goodrich, 1859

"The shell of <em>Limacina rostralis</em> resembles a small nautilus in form." &mdash; Goodrich, 1859

Limacina, rostralis

"The shell of Limacina rostralis resembles a small nautilus in form." — Goodrich, 1859