 | Prideaux John Selby, William Jardine - 1837 - 664 pagine
...external covering, fixed to one place, and condemned to live amidst eternal darkness, they, says Muller, " by opening their valves, enjoy light, and move at...water, the humid air of their sphere. If they meet any unforseen object they conceal themselves all at once in their shells, and shut the valves, so that... | |
 | James Samuelson, Henry Lawson, William Sweetland Dallas - 1867 - 544 pagine
...sometimes burying themselves in the mud, and at others darting through the water, the humid element of their sphere. If they meet any unforeseen object, they conceal themselves at once * Legion, Lophyropoda ; order, Os'.racoda. within their shells and close the valves, so that... | |
 | Mordecai Cubitt Cooke - 1880 - 282 pagine
...not perish along with the parents, for they can be hatched in four or five days after being placed in water." Instead of being fixed to one place, and condemned...that force and address seek in vain to open them." But what are the uses of these little Crustaceans in the economy of nature ? This is a question which... | |
 | Henry Baldwin Ward, George Chandler Whipple - 1918 - 1130 pagine
...plants and other solid bodies floating in the water." Also "by opening and closing their valves, they enjoy light and move at their will, sometimes burying...water, the humid air of their sphere. If they meet with any unforeseen object, they conceal themselves all at once in their shells and shut the valves,... | |
 | hernry baldwin ward - 1918 - 1240 pagine
...plants and other solid bodies floating in the water." Also "by opening and dosing their valves, they enjoy light and move at their will, sometimes burying...water, the humid air of their sphere. If they meet with any unforeseen object, they conceal themselves all at once in their shells and shut the valves,... | |
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... they" to use the words of Miiller, " by opening their valves, enjoy light, and move at their will, sometimes burying themselves in the mud, sometimes darting through the water, the humid air of their sphere. If they meet any unforeseen object, they... 