Archive image from page 396 of The anatomy, physiology, morphology and. 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; CUbiodiversity4765349-9875 Year: 1890 ( ON THE STRUCTURE OF THE EGG IN THE BLOW-FLY. 68i whether this cuticle is an exudation from their inner surface, is a question similar to that involved in the origin of thecuticular structures of the integument, which has already been discussed. Le
Archive image from page 396 of The anatomy, physiology, morphology and. 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; CUbiodiversity4765349-9875 Year: 1890 ( ON THE STRUCTURE OF THE EGG IN THE BLOW-FLY. 68i whether this cuticle is an exudation from their inner surface, is a question similar to that involved in the origin of thecuticular structures of the integument, which has already been discussed. Leydig, who believes that all cuticular structures are formed as exudations from the surfaces of cells, naturally regards the chorion as having a similar origin, and the hexagonal fields as imprints of the cells. As I have no doubt that cuticular mem- branes are formed by the direct metamorphosis of the surface layers of the cell protoplasm, I regard the chorion as the result of such a metamorphosis. In the Blow-fly I believe the whole thickness of the cellular mB Fig. 97.—Details of the structure of the chorion. A, a transverse section through the micropylc canal, near the equator of the egg; >«, micropyle canal, - oil, immersion ; B, a surface view of the micropyle ; c, rosette of cells, ,V oil immer- sion ; C, a surface vievi' of the chorion showing the punctate hexagonal tields, \ objective ; D, a diagrammatic section of the anterior pole of the chorion ; c, outer cellular layer of the chorion ; r/;, cuticular layer of the chorion ; /;, hood of the micropyle ; cl, cleft in the hood continuous with the micropyle canal; III, micropyle; tnc, micropyle canal seen through the semitransparent chorion. layer is transformed into cuticular tissue. In those insects in which the epithelial layer of the chorion is shed as a ' corpus luteuin ' in the oviduct or left in the egg-tube, it appears probable that only a part of the outer epithelial layer is cuticu- larised, or the chor
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