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Genus 2. L E P A S. GENERIC CHARACTER. Animal Triton. Testa basi
affixa multivalvis: valvis inaequalibus erectis. Animal a Triton.
Shell of many valves, fixed at the base: valves unequal and erect.
GENERAL OBSERVATIONS. Some late authors of repute, both abroad and
in this country, struck with the difference of appearance between
the conical and compressed shells of this genus, have separated the
species, and formed them into distinct 'genera. It has been already
stated, that it is not intended in this work to deviate from
theLinnaean order; and this determination arises not only from a
conviction of its superior utility, but also from a desire to
oppose, in some measure, the great inclination which has appeared
of late on the Continent to multiply genera; more it is to be
feared in some cases to the confusion and prejudice, than the
elucidation and advancement, of Natural History. This, however, is
no reason why the opinions of other authors should not be regarded;
and therefore we shall notice how far they are justified in their
proceeding, with respect to the present genus, by considering the
following grounds of separation as proposed by Bruguiere. The
compressed shells, or barnacles, are generally composed of five
valves, not articulated, but merely connected together by a
membrane which bounds their circumference. These valves are
supported on a flexible pedicle, which the animal can lengthen and
contract, or move in any direction at pleasure. The conical, or
acorn shells, on the contrary, are generally composed of six
valves, which form a kind of pyramidal tube, having all its parts
strongly articulated, or joined to each other by delicate sutures.
The base is solid and testaceous, by which they firmly fix
themselves to other bodies. There are fou...
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