. A text-book of invertebrate morphology. Invertebrates. 8UBEINGD0M PROTOZOA. 17 tlirough which the pseudopodia are emitted. The successive chambers are arranged in various vt'ays, sometimes end to end as in Nodosaria, sometimes alternately on opposite sides of an axis as in Textularia, sometimes as a spiral as in Globigerina, sometimes as a helix as in Rotalia (Fig. 5), and sometimes more or less irregularly as in Fig. 5.—Rotalia wnata (after M. Sohultze from Hatsohek). Notwithstanding the complexity of the shell, however, the protoplasm retains throughout the order its simple s
. A text-book of invertebrate morphology. Invertebrates. 8UBEINGD0M PROTOZOA. 17 tlirough which the pseudopodia are emitted. The successive chambers are arranged in various vt'ays, sometimes end to end as in Nodosaria, sometimes alternately on opposite sides of an axis as in Textularia, sometimes as a spiral as in Globigerina, sometimes as a helix as in Rotalia (Fig. 5), and sometimes more or less irregularly as in Fig. 5.—Rotalia wnata (after M. Sohultze from Hatsohek). Notwithstanding the complexity of the shell, however, the protoplasm retains throughout the order its simple structure, and though in the more complicated forms the single nucleus may be replaced by several, yet beyond this they present no more marked differentiation than is found in the simpler genera. 2. Order Heliozoa. In the second order, the Heliozoa, the pseudopodia are slender as in the calcareous Foraminifera and are permanent and somewhat rigid, the central protoplasrn of each one being differentiated into an elastic axial support. The ani- mals are usually globular in shape, the slender pseudopodia radiating out from the central mass, an appearance being thus produced which is sufficient cause for the popular term "sun-animalcule" which is applied to several of the genera, such as Actinophrys and Actinosphcerium (Fig. 6). Currents. 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York, H. Holt and Company
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