RESSA et SACCUTIFERA. _Coates._ Journal Acad. Nat. Sci.
of Philadelphia, vol. vi, p. 132, 1829.

OTION AURITUS. _Macgillivray._ Edinburgh New Phil. Journal, vol.
xxxviii, 1845.

LEPAS LEPORINA. _Poli._ Test. utriusq. Sicil., pl. vi, fig. 21,
1795.

LEPAS CORNUTA. _Montagu._ Linn. Trans., vol. xi, p. 179, 1815.

CONCHODERMA AURITUM et LEPORINUM. _Olfers._ Magaz. der Gesell.
Freunde zu Berlin, 3d Quartel., p. 177, 1814.

BRANTA AURITA. _Oken._ Lehrbuch der Naturgesch., Th. 11, p. 362,
1815.

MALACOTTA BIVALVIS. _Schumacher._ Essai d'un Nouveau Syst., &c.,
1817.

GYMNOLEPAS CUVIERII. _De Blainville._ Dict. des Sc. Nat., Art.
Mollusc., Plate, fig. 1, 1824.

[37] Many authors (Poli, Montagu, &c.,) have doubted from the
strangely mistaken description, viz., "ore octovalvi dentato,"
whether this species could be the _Lepas aurita_ of Linnaeus. But
in the Linnean Society, there is a proof plate from Ellis's
"Account of several rare Species of Barnacles," in 'Phil.
Trans.,' 1758, with an excellent figure of the _C. aurita_, and
on the margin in Linnaeus's handwriting is the name _Lepas
aurita_.

_C. capitulo duobus tubularibus quasi-auribus instructo, pone terga
rudimentalia (saepe nulla) positis: scutis bilobatis: carina nulla, aut
omnino rudimentali: pedunculo longo, a capitulo distincte separato._

Capitulum with two tubular ear-like appendages, seated behind the
rudimentary and often absent terga; scuta bilobed; carina absent, or
quite rudimentary; peduncle long, distinctly separated from the
capitulum.

Filaments attached to the pedicels of the second cirrus; two upper
spines of the maxillae pectinated.

_Hab._--Mundane; extremely common. On ships' bottoms from all
parts of the world. Arctic Sea. Greenland. Pacific Ocean. Often
attached to Coronulae on Whales. On slow-moving fish, according
to Dr. A. Gould. Often associated with _C. virgata_, and _Lepas
anatifera_, _L. Hillii_, and _L. anserifera_.

_General Appearance._--The capitulum (seen from above in Pl. III, fig. 4
_a_) is slightly compressed, almost globular, composed of thick
membrane, with two large, ear-like, flexible, tubular, folded
appendages, at the upper end, opening into the sack. These appendages
are seated behind the rudimentary terga when such are present, or behind
the spots which they would have held if not aborted. In a yo