. Animal biology. Biology; Zoology; Physiology. SURVEY OF UNICELLULAR ANIMALS 49 gether so that the shell becomes essentially an internal struc- ture. The almost incalculable number of Foraminifera constitutes an important source of marine food for small animals which, in turn, are the food of economically important fishes. The more resistant Foraminifera shells sinking to the sea-bottom cover vast areas with the so-called Globigerina ooze, accumulation of which in the geologic past is evidenced to-day by the chalk cliffs of Eng- land. The Pyramids and the Sphinx are built of Foraminiferous ro
. Animal biology. Biology; Zoology; Physiology. SURVEY OF UNICELLULAR ANIMALS 49 gether so that the shell becomes essentially an internal struc- ture. The almost incalculable number of Foraminifera constitutes an important source of marine food for small animals which, in turn, are the food of economically important fishes. The more resistant Foraminifera shells sinking to the sea-bottom cover vast areas with the so-called Globigerina ooze, accumulation of which in the geologic past is evidenced to-day by the chalk cliffs of Eng- land. The Pyramids and the Sphinx are built of Foraminiferous rock. (Figs. 20, 244.) The final two orders of the Sarcodina, known as the Heliozoa and Radiolaria, are characterized by unbranched, radiating pseudopodia, each supported by a core of more dense protoplasm. Most species are floating, spherical forms and the pseudopodia,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company
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