Marshall—Reproductive Organs of the Female Moth. 5 
as the others, but are much wider and situated in the basal part 
of each cell. These cells do 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 same 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 wdiieh surrounds them 
being darker than in other parts of the cells, without any- bound¬ 
aries separating them from 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 w r all 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 copulatrix .—From the opening in the gential plate, 
ostium bursae, a short tube .1 mm. in length leads into the bursa 
copulatrix. This is an elongated sac pyriform in shape, some 
5mm. in length, 1.25mm. wide at ■ narrowest, and 2inm. at the 
widest part. The wail 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 pros- 
