Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 ' FIG. 3. — Difflugia. A lobose FIG. 4. — Foraminifera. A, Biloculina with Rhizopod with a shell of extended pseudopodia (after Schultze); B, grains of sand. Common chambered shell of Globigerina. in fresh water. Order II. Foraminifera. Numerous slender pseudopo- dia which branch and unite to form networks. Nearly all are marine. Most species form calcareous shells which in many species increase with growth by adding addi- tional chambers to the original one. There is a terminal apert
Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 ' FIG. 3. — Difflugia. A lobose FIG. 4. — Foraminifera. A, Biloculina with Rhizopod with a shell of extended pseudopodia (after Schultze); B, grains of sand. Common chambered shell of Globigerina. in fresh water. Order II. Foraminifera. Numerous slender pseudopo- dia which branch and unite to form networks. Nearly all are marine. Most species form calcareous shells which in many species increase with growth by adding addi- tional chambers to the original one. There is a terminal aperture for the extension of the pseudopodia and in many minute pores through the sides of the shell. These forms occur in large numbers in certain seas and the dead shells are forming thick layers at the bottom of the ocean. They have done the same in ages past and in various parts of the earth are thick beds of limestone largely built up from their dead shells. Indeed they are the largest contributors to the formation of rock of all animals.
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