Archive image from page 32 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 ( THE TRACHEAL SYSTEM OF THE BLOW-FLY. 369 the reticular connective tissue, which are also formed from the proliferating cells of the peritoneal coat of the new tracheal vessels. The process is intrinsically identical with that by which the principal
Archive image from page 32 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 ( THE TRACHEAL SYSTEM OF THE BLOW-FLY. 369 the reticular connective tissue, which are also formed from the proliferating cells of the peritoneal coat of the new tracheal vessels. The process is intrinsically identical with that by which the principal tracheal trunks are formed in the embryo; except that the germs of the new vessels are developed as buds, instead of being directly differentiated from the parablast. The Posterior Spiracles of the newly-hatched larva are circular orifices in the transverse stigmatic furrow (Fig. 41), but at the first moult these simple spiracles are replaced by the stigmatic plates. Each of these is at first perforated by two slit-like openings, but at the next ecdysis a third slit-like opening is developed between them, and the stigmatic plate assumes the characters of that of the adult larva already described (see p. 49). Fig. 49.—The Posterior Spiracles of tlie Embryo .ind Larva: /, the posterior spiracles of the fuUy-tleveloped embryo, showing the bulbiform enlargements of the peritoneal coat of the main trachciC from which the second set of tracheccare developed ; .=•, the posterior spiracles of the larva after the first ecdysis ; j-, the posterior spiracles of the larva after the second ecdysis ; st, the first; st', the second, and st', the third spiracles. The Stigmatic Plate is developed from the hypodermis, and exhibits a scar on its inner edge produced by the closure of the circular spiracle of the mature embryo. The second spiracle is not formed by a modification of the first, but is a new formation. In the newly-hatched larva the great tracheal trunk exhibits a bulb-like pr
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