. Cuvier's animal kingdom : arranged according to its organization. Animals. 380 agape at both extremities. They live almost uniformly buried in sand or mud, in rocks or in wood. The Myad^ {Mya, Linn.)— Are bivalved shells with a variable hinge. The double tube forms a fleshy cyhnder ; the foot is com- pressed. From variations in the hinge MM. Daudin, Lamarck, &c., have established the following subdivisions, the tirst three having an internal ligament. Lutraria, Lam.—The ligament, like that of the Mactra, is inserted in a large triangiilar fossa in each valve, and in front of t
. Cuvier's animal kingdom : arranged according to its organization. Animals. 380 agape at both extremities. They live almost uniformly buried in sand or mud, in rocks or in wood. The Myad^ {Mya, Linn.)— Are bivalved shells with a variable hinge. The double tube forms a fleshy cyhnder ; the foot is com- pressed. From variations in the hinge MM. Daudin, Lamarck, &c., have established the following subdivisions, the tirst three having an internal ligament. Lutraria, Lam.—The ligament, like that of the Mactra, is inserted in a large triangiilar fossa in each valve, and in front of that fossa is a small tooth en chevron, but there are no lateral teeth. The ^ape of the valves is wide, particularly at the posterior end, whence the large double tube for respiration and excremential matters protrudes. The foot, which issues at the opposite end, is small and compressed. The species burrow in sand at the mouth of rivers. Mya, Lam., has in one valve a broad, spoon-shaped tooth, which projects into the other valve, in which there is a fossa, and the ligament is stretched from the fossa to the tooth. The species on our shores burrow in sand. Near to the Myae we ought to place the Anatime, Lam., that have a small moveable testaceous appendage, connected with the ligament immediately before the hinder teeth. In the Solemya, Lam., the ligament appears externally, but a portion of it remains attached to a spoon-shaped tooth in each valve. There is no other tooth in the hinge. A thick epidermis overlaps the margins of the shell. An example (Tellina togata, Poli) lives in the Mediterranean. [The animal is so remarkable that it may become the type of a distinct family, for, instead of four lamellar branchiae, it has two only, which are pectinate, or rather pen- nate.] Glijcymeris, Lam. (Crytodairia, Daud.), has neither teeth, nor laminœ, nor fossae, in the hinge, but a simple callosity, behind which there is an external ligament. The animal is similar to Mya. The bes
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