The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . ntermediate in itsstructure between -Etheria and Ostrea, and as apparently connecting the regular freshwater liivalveswith the irregular marine bivalves (Ostrea;), and with the genus .Etheria, inasmuch as in the sinus atthe posterior extremity of the ligament it resembles the Naiades and the ^^Itherias; and in its singlemuscular impression, as well as its general form, it approaches to Ostrea.] Etheri.«, Lara.—-Vre large mequivalved shells, as, or even more,
The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . ntermediate in itsstructure between -Etheria and Ostrea, and as apparently connecting the regular freshwater liivalveswith the irregular marine bivalves (Ostrea;), and with the genus .Etheria, inasmuch as in the sinus atthe posterior extremity of the ligament it resembles the Naiades and the ^^Itherias; and in its singlemuscular impression, as well as its general form, it approaches to Ostrea.] Etheri.«, Lara.—-Vre large mequivalved shells, as, or even more, irregular than the Oysters, without teeth to the hinge,and where the ligament, in part external, exists also interiorly. They differ from the Ostrea; in havingtwo muscular impressions. It is not ascertained that their animal produces a byssus. They have latelybeen discovered in the Upper Hile. AvicuLA, Prug.—Has a shell with equal valves, and a rectilinear hinge, often extended into wings on each side, furnishedwith a narrow, elongated ligament, and sometimes with small deuticulations on that side which is next 374 MOLLUSC the mouth of the animal. The anterior side, a little under the angle of the side of the mouth, has anotch for tlie byssus. The anterior adductor muscle is as yet excessively little. When the ears areIcbS proniiiHMit, the species have named Pintadines, Lam. {Margarita^ Leach). The most celebrated is the Pearl-mussel (Mytilus mar-ijaritiferusy Linn.) Its nacred interior is employed in allsorts of fancy-work, and the orient-pearls, fished for bydivers, ehieriy at Ceylon, at Cape Comorin, and in the Per-sian Gulf, are but excretions of it. The name of Avicutais ^iven to such species as have the ears more pointed, andthe shell more oblique. There is in the hin^e in front of thelii^ament, avesti^^eof a tooth, whose first trace is indeed to beletected in the Pentadines. The SJi/fUus hininiio, lAnu t isan example from the Mediterranean, remarkable for
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Keywords: ., bookauthorwe, bookcentury1800, bookdecade1840, booksubjectanimals
