788 Wisconsin Academy of Sciences, Arts, and Letters. 
PLATE LXIX. 
Fig. 16. Inner view of one half of the oesophageal valve, two plates 
of the gizzard shown, a, where fore-and mid-intestines join. 
Fig. 17. The gizzard opened longitudinally to show the four plates. 
X 15. 
Fig. 18. Surface view of one of the plates of the gizzard. The poster¬ 
ior half shows the rectangular area covered by the small chitin- 
ous projections (Fig. 14). X 52. 
Fig. 19. Transverse section through the gizzard, cut near the anterior 
end of the plates. X 70. In this and the following figure, 20, 
the inner irregular line represents the cuticular layer and the 
four plates are shown thicker, as they are, than the rest of it. 
Fig. 20. Transverse section through the gizzard near the posterior 
end of the plates. X 110. 
Fig. 21. Transverse section through wall of gizzard in position of one 
of the plates. X 875. Cu. Cuticula (plate). 
Fig. 22. Longitudinal section through the oesophageal valve show¬ 
ing at x the place where fore-and mid-intestines join, (a of 
Fig. 16.) 
Fig. 23. Longitudinal section through a portion of the wall of the 
mid-intestine showing three of the primary folds and the sec¬ 
ondary ones between them. X 110. x, outer surface. 
Fig. 24. A small piece of the wall of the mid-intestine, from a longi¬ 
tudinal section. X 740. Stl. Striated layer. 
Fig. 25. Part of wall of mid-intestine very near the posterior end—■ 
from a transverse section. X 1100. Stl. Striated layer. Bm. 
Basement membrane. Nd. Nidus. 
Fig. 26. External view of hind-intestine. 
Fig. 27. Outline view of a transverse section through the anterior 
part of the ileum. The region occupied by the large cells is 
strippled. X 105. 
Fig. 28. Outline view of a transverse section through a region at 
about the middle of the ileum. At this place there are two areas 
of large cells, these are strippled. X 105. 
Fig. 29. Partially diagrammatic longitudinal section through the ali¬ 
mentary canal at union of ileum, II. with rectum, Rt. X 40. 
Pg. Pigment. 
Fig. 30. Part of transverse section of ileum showing the regular epi¬ 
thelial cells, Epth. and the cuticula, Cu. Nothing else drawn. 
X 550. 
Fig. 31. Part of a transverse section of the ileum showing the large 
cells. X 435. 
Fig. 32. Salivary glands, S. gl. and under surface of hypopharynx, 
Hyp. X 18. 1. Portion of the duct that is shown enlarged in 
figure 33. 
Fig. 33. Optical section of that portion of duct from salivary gland 
that is covered for a short distance by an extension of the 
cells of the reservoir. The same structure is found on the ducts 
just after leaving the reservoir. Position of the piece here fig¬ 
ured is shown at 1 in figure 32. X 280. 
