The royal natural history . Polystomella (magnified 200 diameters). the ocean floor. His opinion is partly based on the fact that the area of Glob-igerina ooze coincides with the area of surface temperature at which Globigerinas SUN-ANIMAL CULES. 559. are found to exist. When the surface water is too cold for surface Globigerinas,no Globigerina ooze is found below. Numerous species of Foraminifera, which live only at the bottom, and are never foundat the surface, contribute a small percentageto the composition of the ooze, the bulk ofwhich is, however, formed of organisms whichhave rained down
The royal natural history . Polystomella (magnified 200 diameters). the ocean floor. His opinion is partly based on the fact that the area of Glob-igerina ooze coincides with the area of surface temperature at which Globigerinas SUN-ANIMAL CULES. 559. are found to exist. When the surface water is too cold for surface Globigerinas,no Globigerina ooze is found below. Numerous species of Foraminifera, which live only at the bottom, and are never foundat the surface, contribute a small percentageto the composition of the ooze, the bulk ofwhich is, however, formed of organisms whichhave rained down from the surface. Thedeposits occurring in depths over two thousandfive hundred fathoms do not contain calcareousmatter. The rain of Foraminifera skeletonsfalls down from the surface as over the areas oflesser depth, but the shells are dissolved beforethey reach the bottom, apparently by the excessof carbonic acid in the deep zones of the the ooze is formed of red clay,—a materialsarcode body of Polystomdla after shell probably resulting from the disintegration of HAS BEEN DISSOLVED IN ACID. CI, Nucleus ?. . te (200 diameters). volcanic remains, pumice, etc., and almost devoid of organic traces. This deposit extends in itsm
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectzoology
