The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . are ftpt to niiiflcnd, ami .ire otherwise objectionable,le student should remember tliat tlie liijameiu is always Im the pos-rior side of the hcaiis. t EriirijHi, Lam., is allied to Mactra, but indiffereiitlv charactcr-•li. One portion of them may be Crassatella;. Amphidesmn, Lam.,Lignln of Montagu, appear also to be atlined to Maetra ; but they? too little known to assign to them a definite place. {Eri/vina hasen since well defined by Sowerby, who has charac
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . are ftpt to niiiflcnd, ami .ire otherwise objectionable,le student should remember tliat tlie liijameiu is always Im the pos-rior side of the hcaiis. t EriirijHi, Lam., is allied to Mactra, but indiffereiitlv charactcr-•li. One portion of them may be Crassatella;. Amphidesmn, Lam.,Lignln of Montagu, appear also to be atlined to Maetra ; but they? too little known to assign to them a definite place. {Eri/vina hasen since well defined by Sowerby, who has characterized three species. The same author has also given a good definition of ., which is not synonyntous with the Liguta: but our limitsprevent us noils » detail. Citmiiigia, Sowerby, should be placednear to Aniphide-mii. It is for the dissimilarity of thehin^c of tile two valves, one havinif a strong- lateral tooth on each sideof the ligament, and tlie other beiiii; entirely destitute of Literal species are found in sanil, in the fissures of rocks, and, so far as isknown, they are tropical.]. 3 so MOLLUSCA. agape at both extremities. They live ahnost miiformly ouried in sand or mud, in rocks or in wood. The Myad^e {Mya, Linn.)— Are bivalved shells with a variable hinge. The double tube forms a fleshy cylinder ; the foot is com-pressed. From variations in the hinge MM. Daudin, Lamarck, & have established the followingsubdivisions, the first three having an internal ligament. Lutraria, Lam.—Tlie ligament, like that of the Mactra, is inserted in a large triangular fossa in each valve, andin front of that fossa is a small tooth en chevron, but there are no lateral teeth. The gape of the valves is wide,particularly at the posterior end, vphence the large double tube for respiration and excremential matters foot, which issues at the opposite end, is small and compressed. The species burrow in sand at the mouth ofrivers. Mya, L
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Keywords: ., bookcentury1800, bookdecade1840, booksubjecta, booksubjectzoology
