Skinner, Ernest B. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XV, Part I (1904)
Marshall, Wm. S.
The reproductive organs of the female maia moth, Hemileuca maia (Drury), pp. -Plate II ff. PDF (3.9 MB)
Marshall-Reproductive Organs of the Female Moth. as the others, but are nmuch wider and situated in the basal part of each cell. These cells dlo not show any longitudinal striation, but large vacuoles are present in the cytoplasm. The inner chitinous layer is much reduced in thickness. Near the free ends of these cells there is a row of bodies which are apparently nuclei. They have the saire general structure as the large nuclei, but differ from them in shape and size. These nuclei, if they are such, lie free in the cytoplasm, that which surrounds them being darker than in other parts of the cells, without any bound- aries separating them tronm each other or cutting them off from other parts of the cells. Where the large and small parts pass into each other the cells of the wall change very gradually (Fig. 12), the cylindrical cells of the smaller part gradually getting shorter and shorter until they become flattened as we find them in the larger part of the receptacle. Here (Fig. 11) the wall is much thinner, due al- most entirely to a flattening of the epithelial cells, the chitinous lining and layer of circular muscles both being nearly as thick as in the small part. The epithelial cells in the smaller part have an active glandular appearance, but here in the larger part they are very much reduced. Their nuclei have chromatin granules which are gathered in an irregular mass near the center, and have the appearance of being functionless. Even the circular muscles (we take those bodies we have drawn on the outer sur- face of the wall to be such) do not have the same appearance as those we find in the small part of the receptacle, and we judge that this wall is entirely inactive. Bursa copi'latrix.-Fronm the opening in the gential plate, ostium bursae, a short tube .1 mim. in length leads into the bursa copulatrix. This is an elongated sac pyriform in shape, some 5mm. in length, 1.25mum. wide at narrowest, and 2mm. at the widest part. The wall is thin. having apparently no function other than that of an enclosing sac; in section it appears to be without any definite structure, but composed of a fibrous-like mass in which nuclei lie irregularly scattered. These nuclei show no structure other than that each contains a number of what appear to be small chromatin granules. From the prox- L 5
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