508 
Wisconsin Academy of Sciences, Arts, and Letters. 
EXPLANATION OF PLATE XXXVI. 
Fig. 19. Seminal vesicle. X 26. 
Fig. 20. Basal portion of seminal follicles. Only four of the six seen. 
X 20. 
Fig. 20 A. Section through wall of seminal vesicle, base of cells to left. 
X 1000. 
Fig. 21. Longitudinal section of wall of the vas deferens below the 
seminal vesicle. To the left base of cells; the longitudinal 
and the circular muscular layers are shown. X630. 
Fig. 22. Transverse section through the ejaculatory duct—but half the 
duct shown. Within, to the left, the chitinous layer fol¬ 
lowed by the layer of epithelial cells and the circular mus¬ 
cles. X 630. 
Fig. 23. Dorsal view showing female reproductive organs. T. F., ter¬ 
minal filaments. N. C., nutritive chambers. E. C., egg cham¬ 
bers. Gv., oviduct. G., gland. X 2. 
Fig. 24. The five ovarian tubules of an ovary dissected apart. X 2. 
Fig. 25. Longitudinal section of a nutritive chamber and of the first of 
the egg chambers. N. C., nutritive chamber. Y., central 
yolk mass. N. T., nutritive tube leading from yolk mass to 
one of the egg chambers. X 37. 
Fig. 26. Longitudinal section of wall of the gland, G., in figure 23. 
ext., external surface. X 630. 
Fig. 27. Dissection of muscles of the prothorax. V. M., the dorsal pair 
of central muscles which raise the head. D. M., the ventral 
pair. On either side are seen the two muscles which pass to 
the anterior legs. X 6. 
