Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 802
but the older shells are thicker,their surface is raised into ridges that form a hexagonal areolationround the pores (fig. 562) ; and this thickening is shown by examina-tion of thin sections of the shell to be produced by an exogenousdeposit around the original chamber-wall (corresponding with the… … Fig. 561.—Globigerina bulloides as seen in three positions. 746 MICROSCOPIC FORMS OF ANIMAL LIFE of the ocean by the tow-net, which was systematically carried onduring the voyage of the Challenger, brought into prominence thefact that these waters in all but the coldest seas are inhabited…
Microscopy
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