. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). Flli. 24 —DlAGKAMS ILLUSTRATING THE SEGMENTATION OP THE OvUM. A, fuur-celled stuge. B, eit>bt-ct!lled stuge of a telolecithal ovum. C, sixteen-celled stage. D, blastula. Tile uiTows iudicate the mode of division. the organism free-swimming, moving through the water with a rotatory movement about a definite axis, one and the same end of which is always anterior. In many blastulas, however, especially in those which for one reason or another are not free-swimming, an e
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). Flli. 24 —DlAGKAMS ILLUSTRATING THE SEGMENTATION OP THE OvUM. A, fuur-celled stuge. B, eit>bt-ct!lled stuge of a telolecithal ovum. C, sixteen-celled stage. D, blastula. Tile uiTows iudicate the mode of division. the organism free-swimming, moving through the water with a rotatory movement about a definite axis, one and the same end of which is always anterior. In many blastulas, however, especially in those which for one reason or another are not free-swimming, an early dilferentiation of the cells takes place, especially at the extremity which is posterior in the free- swimming forms or which corresponds to that pole in the non-motile embryos. These posterior cells are usually some- what larger than those at the anterior pole, and if much food- yolk is present in the embryo it is especially concentrated 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York : H. Holt
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
