 This is a kind of shell-fish, with a shell composed of two pieces, of which, as in the oyster, one is fixed and the other free. " The upper valve is almost invariably wanting, though occasionally found in a perfect state of preservation in the white chalk...  Discourses Biological and Geological: Essays - Page 22by Thomas Henry Huxley - 1894 - 388 lehteFull view - About this book
 | Sir Charles Lyell - 1838 - 576 lehte
...almost Fig. 11. invariably wanting, though occasionally found in a perfect state of preservation in white chalk at some distance. In this case, we see clearly that the seaurchinfirst lived from y°uth to c±!ra?Lchedeofthe age, then died and lost its spines, 4. Upper... | |
 | Sir Charles Lyell - 1839 - 332 lehte
...11.) is almost invariably wanting, though occasionally found in a perfect state of preservation in white chalk at some distance. In this case, we see...its spines which were carried away. Then the young a. EMnus from the Crania adhered to the bared shell, and perishva^ve'of'the^nHtia ed in its turn ,... | |
 | Sir Charles Lyell - 1841 - 486 lehte
...from youth to age, then died with lower valve of the ' >d lost its sPines> which were Cromadeuched. Crania adhered to the bared shell, grew, and perished...lower before the Echinus became enveloped in chalky mud. It may be well to mention one more illustration of the manner in which single fossils may sometimes... | |
 | Sir Charles Lyell - 1841 - 946 lehte
...almost inRg. is. variably wanting, though occasionally found in a perfect state of preservation in white chalk at some distance. In this case, we see clearly that the sea-urchin first k, lived from youth to age, then died with lower vmlve of the' Crania attached. and lost its spines,... | |
 | Sir Charles Lyell - 1845 - 338 lehte
...11.) is almost invariably wanting, though occasionally found in a perfect slate of preservation in white chalk at some distance. In this case, we see...its spines which were carried away. Then the young a. EcMntut from the Crania adhered to the bared shell, and perishva?ve'oftthe'Cra7ii'i ed 'n its turn... | |
 | Sir Charles Lyell - 1851 - 602 lehte
...13.) is almost invariably wanting, though occasionally found in a perfect state of preservation in white chalk at some distance. In this case, we see...after which the upper valve was separated from the tue lower before the Echinus became enveloped in chalky mud. It may be well to mention one more illustration... | |
 | Sir Charles Lyell - 1852 - 578 lehte
...invariably wanting, though b. Upper valve of the ' occasionally found in a perfect state of preservation in white chalk at some distance. In this case, we see...turn; after which the upper valve was separated from Crania attached. the lower before the Echinus became enveloped in Crania detached. chalky III 11i1.... | |
 | Sir Charles Lyell - 1854 - 556 lehte
...fig. 13) is almost invariably wanting, though occasionally found in a perfect state of preservation in white chalk at some distance. In this case, we see...youth to age, then died and lost its spines, which wciv carried away. Then the young Crania adhered to the bared shell, grew and perished in its turn;... | |
 | Sir Charles Lyell - 1855 - 686 lehte
...fig. 13) is almost invariably wanting, though occasionally found in a perfect state of preservation in white chalk at some distance. In this case, we see...perished in its turn ; after which the upper valve was attached. separated from the lower before the Echinus became ». Upper valve of th« * Crania detached,... | |
 | Sir Charles Lyell - 1866 - 910 lehte
...fig. 13) is almost invariably wanting, though occasionally found in a perfect state of preservation in white chalk at some distance. In this case, we see...young Crania adhered to the bared shell, grew and _j" Crania perished in its turn; after which the upper valve was attached. separated from the lower... | |
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