. Das Museum der Naturgeschichte, mit einleitenden Essay über die Naturgeschichte der Urwelt : Ein populäres Konto der Struktur, der Gewohnheiten und der Klassifizierung der verschiedenen Abteilungen des Tierreiches seiend, Vierfüßler, Vögel, Reptilien, Fische, Muscheln und Insekten, einschließlich der Insekte, die zur Landwirtschaft zerstörend sind. Er liefern Gegenstände für das Kabinett des Sammlers, noch Materialien für die Spekulation des thegeologist. Eine Geschichte von Weichtieren wäre jedoch unvollkommen ohne eine Darstellung dieser schalenlosen Weichtiere, wie Cuvier sie nennt. Die Tunicalaor Tunicaries dann, ma

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. The museum of natural history, with introductory essay on the natural history of the primeval world : being a popular account of the structure, habits, and classification of the various departments of the animal kingdom, quadrupeds, birds, reptiles, fishes, shells, and insects, including the insects destructive to agriculture . er furnish objects for the cabinet ofthe collector, nor materials for the speculation of thegeologist. A history of molluscous animals, however, would be imperfect without an account of these shell-less mollusks, as Cuvier calls them. The Tunicalaor Tunicaries then, may be characterized as molluscousanimals which have no true shell, but are envelopedin a soft, organized, coriaceous, or gelatinous tunic ormantle. This tunic is constructed in the form of asac with two openings, or shaped like a tube, of greateror less dimensions, open at both ends ; and is adherentby its base, or by a long flexible peduncle, to someforeign body, as stones, sea-weeds, &c., or else floatsfreely on the surface of the water. Inside this sac wefind a second tunic, which is extremely muscular andalways smooth, while the outer surface is sometimesrough and warty. Within this tunic are lodged theviscera, consisting of well-defined organs of respiration, •circulation, and digestion, and a nervous system. The. Ascidiau, laid upeD to show brancliial sac. respiratory or branchial organ is in form of a sac of anoblong, oval, or rectangular shape, and in the Ascidiansis a large bag of vascular network furnished with vibratilecilia, and being jjorous, allowing the water to passreadily through it into the mantle cavity, and thence out by the exhalant orifice—(fig. 231). The heart is asimple, elongated, vasiform muscle, inclosed in a peri-cardium, attached to the branchial sac, continued ateither end into a vessel—the ramifications of one beingexpended chiefly upon the respiratory oigan, those of theotherupon thevisccra and tunics of thebody. Accordingto the direction of

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