. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 14 IN VEliTKlilU TE MOIWUOLOG Y. cialized for reprocluctivo purposes, while the rest take but little part in this process. Such a colouy presents iudica- tious of a passage towards a higher grade of individuality, some of the various cell-individuals merging to a certain ox- tent their individualities in that of the entire colony, and becoming somewhat dependent for existence on the coopera- tion of their fellows. This dependence, however, never reaches a high degree of
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 14 IN VEliTKlilU TE MOIWUOLOG Y. cialized for reprocluctivo purposes, while the rest take but little part in this process. Such a colouy presents iudica- tious of a passage towards a higher grade of individuality, some of the various cell-individuals merging to a certain ox- tent their individualities in that of the entire colony, and becoming somewhat dependent for existence on the coopera- tion of their fellows. This dependence, however, never reaches a high degree of development in the Protozoa and is for the most part entirely absent. It is in this respect that colonial Protozoa difter from the higher organisms, but the difference is one of degree, not of kind. Four well-marked classes may be distinguished among the Protozoa: I. CI. llhizopoda. IT. CI. Si)()r()Z()a. III. CI. riagellata. ly. Cl, Infusoria. I. Class Rhizopoda. The simplest liliizopods present an approach to the least complicated condition uutler Avhich protoplasm is known to us. They are simj)ly small masses of protoplasm, more or less granular towards the centre, clearer towards the periph- cv. Fig. Z.—AmcRba protem (after Ghubkr). cv = contractile vacuole. n = nucleus. pa = pseudopodium. ery, and continually alter their shape by pushing out lobe- or thread-like processes known as pseiidopodia (Fig. 3, joa).. 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
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