. A general guide to the British Museum (Natural History) ... With plans and a view of the building. British Museum (Natural History). SHELL GALLERY. 57 The collection is contained in four parallel rows of table- cases, the arrangement commencing on the right as the gallery is entered. The first two rows contain the marine forms of Gastropods—a division which includes Snails, Slugs, Whelks (fig. 28), and aU those Molluscs which crawl upon the under surface of their bodies; the Cones, Volutes, Mitras, and Murexes forming some of the most attractive groups. The two rows of cases on the left cont
. A general guide to the British Museum (Natural History) ... With plans and a view of the building. British Museum (Natural History). SHELL GALLERY. 57 The collection is contained in four parallel rows of table- cases, the arrangement commencing on the right as the gallery is entered. The first two rows contain the marine forms of Gastropods—a division which includes Snails, Slugs, Whelks (fig. 28), and aU those Molluscs which crawl upon the under surface of their bodies; the Cones, Volutes, Mitras, and Murexes forming some of the most attractive groups. The two rows of cases on the left contain the Land-Shells, Bivalves, and Cephalopods. The Cockles, Oysters, Clams, Piddocks, Teredos, Scallops, and Ark-SheUs represent some of the principal types of Bivalves, so called on account of their shells being formed of two pieces or valves. A Giant Clam (fig. 29), on the floor of the y Fia. 30.—The Peaelt Nautilus (Nautilus pompilim). a, body; 6, siphuncle; c, eye; d, hood; s, tentacles; /, muBcle of attachment to the shell; g, siphon. weighs 310 lbs. The Argonaut, the beautiful Pearly Nautilus (fig. 30), the Octopus, Squids, and Cuttlefishes are the chief kinds of modern Cephalopods; but there are a number of fossil forms, most of which are exhibited in the Geolog'ical Department. In the same gallery are exhibited three other groups of marine sea-llats, organisms, respectively known as Polyzoa, Brachiopoda, and ^nd'sel^*^' Tunicata. Many of the former live in colonies, and are squirts, known as Sea-Mats. They are often mistaken for sea-weeds, although they are really animals of high organisation. The Brachiopods have two shells like bivalve Molluscs, only the valves are dorsal and ventral—that is to say, back and front —instead of right and left. One valve is frequently per- forated,- hence the name of "; Sea-squirts,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for read
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