Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 130
nsthat will form a satisfactory shell,and, although there is not a perfectregularity in its construction, it isevidently not left entirely to chance.A further development in thedirection of producing a protectivecovering is shown in the beautifulHeliozoa. In this case a sphericalshell is deposited,… … Fia. 116.—^HeUozoa. 128 THE MICROSCOPE
Microscopy
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