. 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. ANA TO MY AND MORPHOLOGY OF INSECTS. 9 ing cells of the nymph or imago—at least, in the metabola and hemi-metabola. Chitin is a nitrogenous substance more nearly related to mucin than to any other substance found in vertebrates. The large hypodermic cells of many larvae exhibit cup-shaped cavities on their outer surface, which present a great s
. 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. ANA TO MY AND MORPHOLOGY OF INSECTS. 9 ing cells of the nymph or imago—at least, in the metabola and hemi-metabola. Chitin is a nitrogenous substance more nearly related to mucin than to any other substance found in vertebrates. The large hypodermic cells of many larvae exhibit cup-shaped cavities on their outer surface, which present a great simila- rity to those of the well-known goblet cells of the mucous membranes. Latreille regarded chitin as the result of the degeneration of the external portion of the cell-substance. Fig. I.—Sections of the skin of the lilow-fly laiva.—i, a vertical section showing the hypodermis /;, with the super-imposed ciilicular layers ; 2, a similar section, showing the cuticular prisms ; 3, a sensory papilla ; 4, a sub-hypodermic cell. cu. Cuticle ; c, nerve end organ ; /, terminal portion of the end organ ; «, nerve; s, sub-hypodermic tissue ; ir, trachea. [9, p. 882], a view in which I must concur. Chitin is very insoluble in solutions of the caustic alkalies, a property which enables the microscopist to make beautiful preparations of the exo- and endo-skeletons of insects. The cuticle consists of two distinct parts, which correspond with the epiostracum and endostracum of the Crustacea.* I shall, therefore, use these terms to distinguish them. * Huxley, T. H., 'The Crayfish.' London, 18S0, p. 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, Pub. for the author by R. H. Porter
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