The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . g intermediate in itsstructure between /Etheria and Ostrea, and as apparently connecting the j-egular freshwater bivalveswith the irregular marine bivalves (Ostreae), and with the genus yEtheria, inasmuch as in the sinus atthe posterior extremity of the ligament it resembles the Naiades and the iEtheriae; and in its singlemuscular impression, as well as its general form, it approaches to Ostrea.] Etheri.«, Lam.—Are large inequivalved shells, as, or even more,
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . g intermediate in itsstructure between /Etheria and Ostrea, and as apparently connecting the j-egular freshwater bivalveswith the irregular marine bivalves (Ostreae), and with the genus yEtheria, inasmuch as in the sinus atthe posterior extremity of the ligament it resembles the Naiades and the iEtheriae; and in its singlemuscular impression, as well as its general form, it approaches to Ostrea.] Etheri.«, Lam.—Are large inequivalved 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 Nile. AvicuLA, Brug.—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 denticulations on that side which is next 374 the mouth of the animal. The anterior side, a little under the angle of the side of the mouth, has anotch for the byssus. The anterior adductor muscle is as yet excessively little. When the ears areless prominent, the species have been named Pintadines, Lam. {Margarita, Leach). The most celebrated is the Pearl-mussel (Mytilus mar-(/ariii/erus, Linn.) Its nacred interior is employed in allsorts of fancy-work, and the orient-pearls, fished for bydivers, chiefly at Ceylon, at Cape Comorin, and in the Per-sian Gulf, are but e.\cretions of it. The name of Aviculais g-iven to such species as have the ears more pointed, andthe shell more oblique. There is in the hinjfe in front of thelio-ament, a vestige of a tooth, ysfhose first trace is indeed to bedetected in the Pentadines. The Mytilus hiruiido, Linn , isan example from the IMediterranean, remarkable fo
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Keywords: ., bookcentury1800, bookdecade1840, booksubjecta, booksubjectzoology
