Archive image from page 376 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 ( THE DEVELOPMENT UF THE NVMPH. a remarkable palisade-like structure (PI. XVIII., Fig. 8), which Van Rees has mistaken for the developing discs. The large cells of the paraderm give off processes and form new cells beneath them, which enclose a netw
Archive image from page 376 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 ( THE DEVELOPMENT UF THE NVMPH. a remarkable palisade-like structure (PI. XVIII., Fig. 8), which Van Rees has mistaken for the developing discs. The large cells of the paraderm give off processes and form new cells beneath them, which enclose a network of blood sinuses. These reticular septa are well developed between the abdominal segments when the discs are quite small, and they are not replaced by permanent structures until the development of the nymph is far advanced. The Proboscis is developed from two median processes (PI. XIX., c and/). The upper and larger of these, /, repre- sents a layer of imaginal cells, which, in the larva, lie within the pharyngeal sinus (p. 44), and which is withdrawn from the sinus by the shedding of the cephalo-pharyngeal sclerite. It V ic, 45 - \ , d y, 'Iiihiiil; ihe proboscis, ssfl of ilif young nymph. I mil cIl , irclmilLion, inil iIoimI becomes the pro-, meso- and metalabrum. The lower and smaller process, c, is formed by the coalescence of the four appendicular discs of the head (p. 82), and it is from this that the rostrum, pseudolabium and ligula are developed. The maxillary discs (p. 82, Figs. 8, 2, I; 13, mx, and PI. XV., Fig. I, i'), which are first situated on the inner surface of the stomal disc of the larva, increase rapidly in size during the first few hours of the pupa stage, when they lie one on either side of the cephalo-pharynx. After the latter is shed, the discs unite with each other and with two small groups of imaginal cells, one on either side of the orifice of the united sericterial ducts, to form the lower median process, e (PI. XIX.).
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