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)
I Marshal-1Reroductive Orqans of the Female Moth. 3 tubules, these are not bound together in any way, but each one throughout its entire length is separated from the others. Be- fore the expulsion of the eggs each tubule is from 70mm. to 80mm. in length. The number of eggs each contains is not constant, thirty-eight being the average in those counted. The four tubules on each side unite to form an oviduct, 1.5 mm. in length, and the two oviducts join in the median line to form an oviductus communis 2 mm. long. Throughout the entire length, from the distal end of the tubule to that point where the oviductus communis passes into the vagina, the wall is very similar in structure. On the inner surface there is a folded chitinous layer, somewhat thinner near the distal end. The next layer, the epithelial, has, as such, nearly disappeared, and in its place is an empty space contain- ing a few scattered nuclei each of which shows a few irregular chromatin granules. The cytoplasmn, which we can assume was present when the cells were active, has entirely disappeared. Externally each tubule is lined with two muscular layers, an inner circular, and an outer longitudinal layer. Throughout the entire length of the tubule there is only a very slight, if K any, difference in the comparative thickness of these two layers (Figs. 5 and 6). Sections cut through the distal end and the middle of the tubule will show this. The oviductus communis shows a slight change from what we have just described for the ovarian tubule. The remains of the epithelial cells are much more marked, the nuclei appearing at fairly regular intervals, and the cell boundaries, while not com- plete, are present in such a condition as would allow us to limit the boundaries of the cells which were earlier present in this layer. Both muscular layers show a greater development (Fig. 7), and while the circular longitudinal layers bear to each other the same relative thickness that they did in the tubule, both are here very much thicker. In all specimens of iemileuca exam- ined the eggs were fully developed, and in most of the moths they had been in part or entirely expelled from the body. The egg-laying goes on rapidly, and but a short time is needed for the expulsion of all the eggs from the body. The only use the K. '11A
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