The foraminifera: an introduction to the study of the protozoa . FiG. iO.—Mkdiax Sections of Foraminifera, showing StolonPassages through the Septa. A = Peneroplis, with imperforate shell-wall; B = Cristellaria, with perforate shell-wall. sion as the segmental buds are added to the growingshell. The stolon passages are, as may be supposed,

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