. Secrets of earth and sea. Science; Natural history; Archaeology; Art, Primitive. 164 SECRETS OF EARTH AND SEA can crawl like a leech and also swim freely by aid of their wheel-apparatus; (2) the naked free swimmers, which do not crawl, but move only by swimming; (3) the turtle- shelled free swimmers (Fig. 37) like the last, but provided with strong, often faceted, angular, and spike-bearing shells or " bucklers," from which head and wheel-apparatus project in front and narrow tail behind ; (4) the rooted or fixed forms (Figs. 37 bis); these never swim when full grown, but each form

GLIX-115-RDJ4W0

. Secrets of earth and sea. Science; Natural history; Archaeology; Art, Primitive. 164 SECRETS OF EARTH AND SEA can crawl like a leech and also swim freely by aid of their wheel-apparatus; (2) the naked free swimmers, which do not crawl, but move only by swimming; (3) the turtle- shelled free swimmers (Fig. 37) like the last, but provided with strong, often faceted, angular, and spike-bearing shells or " bucklers," from which head and wheel-apparatus project in front and narrow tail behind ; (4) the rooted or fixed forms (Figs. 37 bis); these never swim when full grown, but each form
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. Secrets of earth and sea. Science; Natural history; Archaeology; Art, Primitive. 164 SECRETS OF EARTH AND SEA can crawl like a leech and also swim freely by aid of their wheel-apparatus; (2) the naked free swimmers, which do not crawl, but move only by swimming; (3) the turtle- shelled free swimmers (Fig. 37) like the last, but provided with strong, often faceted, angular, and spike-bearing shells or " bucklers," from which head and wheel-apparatus project in front and narrow tail behind ; (4) the rooted or fixed forms (Figs. 37 bis); these never swim when full grown, but each form

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