Archive image from page 295 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; CUbiodiversity4765349-9885 Year: 1890 ( 252 THE EMBRYOLOGY OF THE fiLOlV-FLY IN THE EGG. very large, and extend on either side of the yeli, Fig. 39) is produced by the contraction of the primitive band, and it communicates with the yelk in front of the ccelomic sacs and behind the proce
Archive image from page 295 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; CUbiodiversity4765349-9885 Year: 1890 ( 252 THE EMBRYOLOGY OF THE fiLOlV-FLY IN THE EGG. very large, and extend on either side of the yeli, Fig. 39) is produced by the contraction of the primitive band, and it communicates with the yelk in front of the ccelomic sacs and behind the procephalic lobes. As the primitive band contracts, the head and tail-folds of the amnion separate, so that the cavity, p, is only divided from the inter- amnial space by its roof of parablast. It becomes the pericardial cavity. Segmentation of the Somatopleure and Ccelomic Sacs.—Even before the epiblast of the somatopleure covers the dorsal Fig. 41.—a dorsal view of an embryo before the somatopleural plates meet on the dorsum of the yelk, showing their segmentation. surface of the yelk, the annular segmentation of the larva becomes apparent by the formation of deep inflections between the segments. These inflections at first only involve the epiblast, but soon extend to the mesoblast. The ccelomic sacs form two cellular plates, with a third incomplete plate between them (PI. XIV., Fig. 2). The external and internal plates become adherent to the involutions of the epiblast between the somites, so that each ccelomic sac is divided into a series of secondary cavities, corresponding in number to the annuli of the epiblast. I have not hitherto seen this stage of development in any of my sections, but Graber gives figures of embryos in which each somite exhibits a distinct cavity between the outer and inner ccelomic plates.
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