. Elementary text-book of zoology [electronic resource]. Zoology. lYPES OF LARVAL, Fig. 16. Section of Blastula. Archicoele. by which it rotates freely about the cenire. It represents the typical centre-symmetric and monoblastic organism. The layer of cells is called the archiblast and the internal cavity the archicoele (or blastocoele). As the organism is com- pletely centro-symmetric there can be no division of labour between the cells ; hence the blastula represents the phyletic stage of a colonial protozoan rather than a true metazoan. 2. Morula —The morula differs. Fig. 17. Section of Mor
. Elementary text-book of zoology [electronic resource]. Zoology. lYPES OF LARVAL, Fig. 16. Section of Blastula. Archicoele. by which it rotates freely about the cenire. It represents the typical centre-symmetric and monoblastic organism. The layer of cells is called the archiblast and the internal cavity the archicoele (or blastocoele). As the organism is com- pletely centro-symmetric there can be no division of labour between the cells ; hence the blastula represents the phyletic stage of a colonial protozoan rather than a true metazoan. 2. Morula —The morula differs. Fig. 17. Section of 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 Masterman, Arthur Thomas; Parsons, John Herbert, Sir, 1868-1957, donor; S. H. Lazarus (Firm); University College, London. Library Services. Edinburgh : E. & S. Livingstone
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1901
