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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. [1]-Plate II ff. PDF (3.9 MB)


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4     Wisconsin Academy of Sciences, Arts, and Letters.
ovarian tubules and oviducts could at this stage possess would
be to aid in expelling the eggs, and we find the parts which
are useful in doing this, the muscular layers, still normal, while
the other part of the wall, epithelial cells, shows a.marked de-
generation.
  Receptaculum semninis.-The seminal receptacle is double con-
sisting of a larger bladder-like, and a smaller tubular piece, the
latter of which is pointed and near its distal end bears a thin
coiled appendix (Fig. 8). The two parts have a common duct
which opens into the apex of a saccular outgrowth near the dis-
tal end of the vagina. The relative size and shape of the two
parts can best be understood by the figure from which there
are, however, many variations, either in a general increase or
diminution in size of the receptacle, or a relative change in one
part to the other. From an external view- the duct appears to
come equally from each part, a section shows at first a simiiar
condition; the cells lining the duct are more like those in the
smaller than in the larger part, being in fact the same cylin-
drical cells, shortened, but not, however, flattened as in the
larger part of the receptacle. The appendix, near the distal end
of the smaller part, shows a considerable variation in length.
In the specimens of Hemileuca examined both parts contained
spermatozoa.
  An examination of sections shows the wall in the two parts
to be different, similar, however, in being lined over the entire
internal surface with chitin. In the smaller part of the recep-
tacle (glandular part), the greater portion of the wall is a layer
of long cylindrical epithelial cells (Fig. 9) which show a de-
cided striation at both ends but more mnarked in the free than
in the basal end. The large ovoid nucleus in each cell contains
a number of chromatin granules connected by a linin network.
On the outer surface of the wall are a number of circular mus-
cles which, three or four layers thick near the proximal end,
gradually diminish until. but a single row is left at the apex.
Sections through the tubular appendage of this part (Fig. 10)
show differences from what we have just described. The cell
boundaries were not visible, the nuclei have the same structure
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