Archive image from page 239 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 ( 546 THE SENSES AND SENSORY ORGANS. on the one hand with the epithehoid membrane covering the neural disc, and on the other penetrate the integumental layer or optic disc. These connecting fibres are at first exceedingly fine and are frequently tor
Archive image from page 239 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 ( 546 THE SENSES AND SENSORY ORGANS. on the one hand with the epithehoid membrane covering the neural disc, and on the other penetrate the integumental layer or optic disc. These connecting fibres are at first exceedingly fine and are frequently torn through by the contraction of the tissues which accompanies their hardening, but a day or two later they are very distinct (PI. XXXIX.). The cells of the integumental disc are seen to be arranged in columns, each column corresponding to a future ommateum. It is exceedingly difficult to determine the number of cells P[(;_ yj.—A section through the optic disc and ganglion of a Blow-fly nymph about the middle of tlie third day of the pupa stage, c, the sub-dioptric space ; d, the optic disc; s, the optic stalk, spreading out into the neural disc; ;/, the rudi- mentary retina of the imago. in each column, but it is quite evident that they are very numerous and form four more or less distinct layers, a corneal layer, a series of bundles of long fusiform cells beneath the corneal layer, a double layer of round cells, and an inner columnar layer. When seen from the surface the integumental disc already
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Keywords: 1890, archive, blowflies, book, bookauthor, bookdecade, bookpublisher, booksubject, bookyear, drawing, historical, history, illustration, image, london_pub_for_the_author_by_r_h_porter, lowne_benjamin_thompson_1839_, page, picture, print, reference, vintage
