. Text-book of zoology for schools and colleges. Zoology. 34 IXVERTEBRATE ANIMALS. mated spider's â ; Lastly, the microscope reveals in the pseudopodia a very curious circulation of minute solid parti- cles or granules, which travel in all directions through the pseudopodial net-work. Internally, the sarcode-body of the Foraminifera exhibits absolutely no structures or definite oi^ gans of any kind. Even the nucleus and contractile vesicle which occur in the Aniceba are here absent, and the only traces of structvu-e are to be found in the existence of scattered gran- ules. Simple as i
. Text-book of zoology for schools and colleges. Zoology. 34 IXVERTEBRATE ANIMALS. mated spider's â ; Lastly, the microscope reveals in the pseudopodia a very curious circulation of minute solid parti- cles or granules, which travel in all directions through the pseudopodial net-work. Internally, the sarcode-body of the Foraminifera exhibits absolutely no structures or definite oi^ gans of any kind. Even the nucleus and contractile vesicle which occur in the Aniceba are here absent, and the only traces of structvu-e are to be found in the existence of scattered gran- ules. Simple as is the sarcode-body of the Foraminifera, it has in all cases the power of secreting a skeleton or shell, which is technically called the "test" (Lat. testa, a, shell). The shell is usually " calcareous "âthat is to say, composed of car- bonate of lime; but it is sometimes " arenaceous," or com- posed of particles of sand united together firmly by an un- known animal cement. In either case, the shell may exhibit one or other of two very distinct types of structure. In the one type (as in Miliola, Fig. 4, h), the shell-walls are not per-. ^°i i7:'}!^f^y''l°^. "^ Foram'nifera. a La{im<t n!iian&, a monothalamous roraminifla-; * J/«foofct (after Schultze), showing the pseudopodia protruded from the oral aperture of the shell; o Jhscorbina (aSter Schultze), showing file nautiloid shell mth fiiamina in the sheU-waUs, giving exit to pseudopodia; d Section of J^odoaaria (after Carpenter')â »Jfodoaanahispida;/eiobigerinabuU<nd6a. y^-^^i, forated with holes, and the pseudopodia are therefore all emitted from the mouth of the shell. In the other type (as in. 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, D. Appleto
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