. Text-book of zoology for junior students. Zoology. KHIZOPODA. 35 AH the Polycystina are microscopic, and they are all inhabitants of the sea. They are best known to students of the microscope as the " Fossil Infusoria of Barba- does" (fig. 14), as they occur in incalculable numbers in a sand- stone in that island. They are, however, in no way related to the " Infusoria " pro- perly so called, having much stronger affinities with the For- aminifera. We know, also, now, tliat deposits of the flinty shells of these beautiful microscopic organisms are in process of for- matio
. Text-book of zoology for junior students. Zoology. KHIZOPODA. 35 AH the Polycystina are microscopic, and they are all inhabitants of the sea. They are best known to students of the microscope as the " Fossil Infusoria of Barba- does" (fig. 14), as they occur in incalculable numbers in a sand- stone in that island. They are, however, in no way related to the " Infusoria " pro- perly so called, having much stronger affinities with the For- aminifera. We know, also, now, tliat deposits of the flinty shells of these beautiful microscopic organisms are in process of for- mation in our oceans at gi'eat depths. In the third family {Collozoa) are included a number of singu- lar gelatinous organisms which may be as large as an ordinary marble, but are often hai'dly visible to the unassisted eye. They are found floating passively at the sur- face of most seas ; and they may either have no skeleton, or may secrete a flinty framework, which may give rise to a fenestrated. ¥\'^. U.—Shells of Polycystiva from the " Biiuhadoes Earth," greatly inagiiitied. (Original.). 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 Nicholson, Henry Alleyne, 1844-1899. New York, American Book Co
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1885
