. Text-book of embryology. Embryology. CHAP. VI NEMEETINEA 119 The development has been worked out by C. B. Wilson (1900), and later by E. B. Wilson (1903), but similar species exist in the Mediterranean with very similar development, and have been worked at by E. B. Wilson's pupils, Yatsu (1904) and Zeleny (1904). The egg of Cerebratulus lacteus whilst still in the ovary has a loose glassy membrane which at one end is drawn out into a point and thus offers a landmark in the egg; after the egg has been laid the spindle for the formation of the first polar body is formed, and this causes _ a, l
. Text-book of embryology. Embryology. CHAP. VI NEMEETINEA 119 The development has been worked out by C. B. Wilson (1900), and later by E. B. Wilson (1903), but similar species exist in the Mediterranean with very similar development, and have been worked at by E. B. Wilson's pupils, Yatsu (1904) and Zeleny (1904). The egg of Cerebratulus lacteus whilst still in the ovary has a loose glassy membrane which at one end is drawn out into a point and thus offers a landmark in the egg; after the egg has been laid the spindle for the formation of the first polar body is formed, and this causes _ a, little protuberance at the opposite pole of the egg. Unless fertilization supervenes the spindle is never completed, but when fertilization takes place the first and then the second polar bodies are nipped off and the loose glassy membrane is dissolved. The egg divides into four macromeres so exactly similar to one. B la" lb". 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 MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan
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