Archive image from page 22 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 ( 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 hypodermi
Archive image from page 22 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 ( 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. 192.
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