The royal natural history . rought to lightthe fact that the floor of the ocean, at depths between five hundred and two thousand five hundredfathoms over vast areas, be-tween 110° north and southof the Equator, is formed of apinkish white mud, containingon an average about 60 percent, of carbonate of lime.The presence of this materialis mainly due to shells ofForaminifera, especially Glob-igerinidce, and, to a smallextent, to the remains ofminute pelagic algre, knownas coccospheres and rhabdo-spheres; the broken fragmentsof the latter in the shape ofdiscs and rods being termedcoccoliths and rh
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The royal natural history . rought to lightthe fact that the floor of the ocean, at depths between five hundred and two thousand five hundredfathoms over vast areas, be-tween 110° north and southof the Equator, is formed of apinkish white mud, containingon an average about 60 percent, of carbonate of lime.The presence of this materialis mainly due to shells ofForaminifera, especially Glob-igerinidce, and, to a smallextent, to the remains ofminute pelagic algre, knownas coccospheres and rhabdo-spheres; the broken fragmentsof the latter in the shape ofdiscs and rods being termedcoccoliths and rhabdoliths.Over the greater part of the floor of the Atlantic, and over immense tracts in theWestern Indian Ocean and Pacific, over areas comprising in all about fifty millionsof square miles, the ocean-bed is formed of Globigerina ooze. Chalk is mainlycomposed of the skeletons of Globigerinidce, coccoliths, etc., and, in fact, resemblesGlobigerina ooze. The question whether the Globigerinidcv, which make up the bulk of the. shells of Globigerina (much magnified). 55§ THE LOWEST ANIMALS. ooze, live at the bottom as well as at the surface, has given rise to much discus-sion. Dr. Murray has come to the conclusion that pelagic species do not live near