. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. tained by that author, were very large number of Insects, thousand different kinds, he tecting the existence of the less than two hundred ; and servations on this apparatus, of the membranes, extend to Fig. 7G*.. till] extended over a Among nearly a succeeded in de- micropyle in not his detailed ob- and the structure one hundred and Micropyle in the ovum of Insects. (From JHeissner.) a. A portion of the upper pole of the ovum of Musca vomitoria from the Vagina. There are shown in succession the vitelline membrane, chorio
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. tained by that author, were very large number of Insects, thousand different kinds, he tecting the existence of the less than two hundred ; and servations on this apparatus, of the membranes, extend to Fig. 7G*.. till] extended over a Among nearly a succeeded in de- micropyle in not his detailed ob- and the structure one hundred and Micropyle in the ovum of Insects. (From JHeissner.) a. A portion of the upper pole of the ovum of Musca vomitoria from the Vagina. There are shown in succession the vitelline membrane, chorion and outer envelope, and at the upper part in profile the micropyle aperture situated in the middle of a nipple-like projection of the chorion, and with a number of spermatozoa involved in it. b. Direct view of the upper pole of the ovum of an insect belonging to the Pyralida. The micro- pyle aperture is seen in the centre of the radiated markings of the chorion. micropyle apparatus in the ova of Insects be- longing to the following genera, viz., Musca, Tipula, Culex, Lampyris, Elater, Teleopho- rus, Adela, Pyralida, Tortrix, Euprepia, Li- paris, Pieris, Panorpa, and in more than one species of several of these genera. The same author also observed and described in Musca vomitoria a number of spermatic filaments entangled in the micropyle. Leuckart's observations, which are fuller and more minute than those of Meissner, and differ in some of their results from those ob- &c., of the Ova of Insects, chiefly pupiparous, in Muller's Archiv. Nos. 1. 2. and 3., February and July, 1855, p. 90., et seq., with five plates, with 122 figures. There can be no doubt that both of these authors made the independent discovery of this curious structure. Perhaps the priority claimed by Leuckart, may be accorded to him, as he had pre- viously stated the probability of its existence in his article " Zeugung," published in 1852, p. Please note that these images are extracted f
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