. 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. THE COMPOUND EYE. 525 stiibchen of Grenacher. In the living insects these form the segments of an ovoid lens divided by longitudinal septa. In the Blow-fly the uninjured great rods before they undergo any post-mortem change appear as very long, highly-refractive, cylindrical bodies, the anterior extremities of which project into the pseudo-cone
. 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. THE COMPOUND EYE. 525 stiibchen of Grenacher. In the living insects these form the segments of an ovoid lens divided by longitudinal septa. In the Blow-fly the uninjured great rods before they undergo any post-mortem change appear as very long, highly-refractive, cylindrical bodies, the anterior extremities of which project into the pseudo-cones, and are nearly hemispherical. These rods when dissociated become twisted or curled, and exhibit pheno- mena similar to those which I observed in the Plume Moth (Ptcrophorm) except that they do not split into longitudinal segments. The so-called axial threads, or longitudinal striae, are not axial at all, but are mere ridges in an elastic sheath (PI. XXXVI., Fig. 2, h and c) and are so placed that they could. KiG. 68.—Isolated portions of the rhabdomes of a Blowfly in various stages of dis- integration. A and B, isolated portions of the internal membrane ; a, filled with fluid; (/</, so called axial threads; C, the rhabdome still surrounded by its protoplasmic sheath; /' /», vacuoles; c, granules ; </, so-called axial threads; e, sheathing substance. not be affected by an axial pencil of light. I shall, however, return to this subject when I discuss the optics of the com- pound eye. I would especially draw attention to Grenacher's figures [222, Figs. 62, 63, 80-82, 85, 88, and 126] and his optical longitudinal sections [222, Figs. 44, 47, 49, and 65], as these are quite consistent with the views here adopted and the phe- nomena observed by me, and they ill accord with the views he has put forward as to the nature of the great rods in his Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1890, bookyear1890
