. 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. 54° THE SENSES AND SENSORY ORGANS. ommatea; but when the final ecdysis occurs, a new optic nerve and retina is developed, which replaces all the partial nerves and retinae of the larval form (Fig. 70). This is formed within the hemisphere, and grows outwards until it reaches the inner surface of the dioptron ; the partial retinae undergo histol
. 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. 54° THE SENSES AND SENSORY ORGANS. ommatea; but when the final ecdysis occurs, a new optic nerve and retina is developed, which replaces all the partial nerves and retinae of the larval form (Fig. 70). This is formed within the hemisphere, and grows outwards until it reaches the inner surface of the dioptron ; the partial retinae undergo histolytic degeneration during its development. I think it. Fig. 70.—The development of the retina in the compound eye of a Dragon-fly (Agrioii) and of the Cockroach (I'erip/aiiela). A, a section of I he eye and optic nerves of the larva of agrion from a specimen 12 mm. long ; li, a similar section from a more advanced larva ; f, a similar section from the nymph of the same ; D, a section through the optic ganglion and nerve of a young Cockroach larva ; 1/, the dioptron ; g^, the ganglion from which the larval optic nerves arise ; ff, the optic ganglion of the imago in a more or less rudimentary condition ; //; b, the membrana basilaris ; rl\ the retina of the larva consisting of separate retinula;; 7/-', the retina of the imago in a more or less rudimentary condition ; tr, tracheal vessel. Reproduced from my paper [233] in the Trans, of the Linn. .See. exceedingly probable that the remarkable ' kidney-shaped' bodies described by Newton [213], in the optic ganglia of the lobster, are retinte and optic nerves, which replace the old retinae in successive ecdyses. Even in the Metabola there are traces of the development. 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.
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1890, bookyear1890
