. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Embryoual development in Chthonius, represented in seven successive stao-es : 6/,, blastoderm (first layer); Wg* mesodermic pells (?); /, follicle ; (j, coarser granules of the protoplasm ; k, Purkinje's vesicle ; kh, vitelline membrane ; p, protoplasm ; j)d, primary deutoplasm- spheres; S7n, secondary membrane; sd, secondary deutoplasm-spheres (nutritive vitellus). The ovum is now developed chiefly by a rapid increase of volume of the protoplasm, in which we must distinguish
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Embryoual development in Chthonius, represented in seven successive stao-es : 6/,, blastoderm (first layer); Wg* mesodermic pells (?); /, follicle ; (j, coarser granules of the protoplasm ; k, Purkinje's vesicle ; kh, vitelline membrane ; p, protoplasm ; j)d, primary deutoplasm- spheres; S7n, secondary membrane; sd, secondary deutoplasm-spheres (nutritive vitellus). The ovum is now developed chiefly by a rapid increase of volume of the protoplasm, in which we must distinguish two kinds of granules, coarser and finer. The coarser granules * Von Wittich, ' Observationes qusedam de Aranearum ex ovo evolu- tione,' Diss, inaug. Halis Saxonise, 1845; and id. "Die Entstehung des Arachnideneies im Eierstock, die ersten Vorgange in demselben nach seinera Verlassen des Mutterkorpers," Miiller's Arch, fiir Anat. und Physiol. 1849, pp. 112-150, pi. iii. (see p. 116). 14*. 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 London, Taylor and Francis, Ltd
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