. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author;. Blowflies. ON THE STRUCTURE OF THE EGG IN THE BLOW-FLY. 679 also developed with its dorsum towards the dorsal aspect of the egg, and its cephalic extremity at the anterior end. The Chorion, or egg-shell, is opaque, with a pearly-white lustre. Its whole surface is divided into beautiful regular hexagonal fields, having a long diameter of'04 mm. and a short
. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author;. Blowflies. ON THE STRUCTURE OF THE EGG IN THE BLOW-FLY. 679 also developed with its dorsum towards the dorsal aspect of the egg, and its cephalic extremity at the anterior end. The Chorion, or egg-shell, is opaque, with a pearly-white lustre. Its whole surface is divided into beautiful regular hexagonal fields, having a long diameter of'04 mm. and a short diameter of'O2 mm. The surface of each field exhibits a fine punctation. After the deposition of the eggs, the chorion, which is at first tough and leathery, becomes so brittle that it. FIG. 96.—Three ova from a mature egg-tube, c, outer cellular layer of the chorion ; ch, epithelial chorion of a young egg ; ch.,, inner layer of the chorion of mature egg 5 °n °-2> and o;t, eggs in different stages of development; o3, a portion of a mature egg showing the infolding of the chorion at the micropyle; yy, yelk cells and yelk. can be readily removed with a pair of needles and a little practice from the subjacent vitelline membrane. This enables the student to observe the developing embryo in optical section through the transparent vitelline membrane. I have found it useful to make a sketch in this way of hardened embryos before embedding them for sections. The whole process is of course performed in the fluid in which the eggs are preserved. I prefer Flemming's 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 Lowne, Benjamin Thompson, 1839-. London, Published for the author by R. H. Porter
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Keywords: ., bookcentury1800, bookdecade1890, bookleafnumber395, bookyear1893
