14 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
several egg follicles developing on the outer side of this organ. As this 
figure indicates, several enlarged germinal cells of varying sizes are 
included in each outpushing of the limiting membrane, but in the 
follicles thus formed the smaller cells evidently have their substance 
appropriated by the larger ones and so never function as ova. In the 
smaller of these cells the cytoplasm stains quite uniformly and rather 
darkly, in the larger it is lighter and more reticulated in appearance 
(text -fig. A, ec 1 and ec 3). In the mature ova there are a number of 
small granules scattered through the cytoplasm. In these cells the 
nuclei (im) are large and rather clear, showing a coarse reticulum in 
which may be seen heavily staining chromatin masses {cr) and a nucleo- 
lus («c), very dark in the small cells but usually lighter in the large 
ones. This same figure (text-fig. A) also shows some sperm in the 
gonadial cavity, here much reduced as compared with its size when 
the sperm is being developed. The presence of this sperm in the 
cavity of the gonad is apparently a very constant feature even after 
the eggs are well developed and the male organs in the head have 
ceased to show signs of activity. 
The excurrent hermaphroditic duct may be roughly divided into 
three parts : a slender tube running to the mouth of the receptaculum 
seminis and accessory glands, a broader portion into which these parts 
open, and a glandular walled vagina opening to the exterior dorsal to 
the right wing. The portion of the duct between the gonad and 
openings of the glands is short and only slightly convoluted. Its 
inner surface is ciliated and its wall is supplied with muscle fibers 
which doubtless assist in expelling the sexual products. 
Opening into the hermaphroditic duct somewhat in front of the 
middle of the body are two glands, the position of which in reference to 
the duct is shown diagrammatically in figure 12 (pi. 4). Inasmuch as 
the function of these glands is not very definitely known, it would seem 
useless and even misleading to attempt to give them names. I shall 
therefore refer to them, and likewise to the penial glands in the head, 
merely by number. The posterior one — the first to open into the 
genital duct on its way to the exterior — is very much smaller and less 
lobulated than the other. In structure the cells of this first gland 
appear coarsely granulated, the granules in the sections studied being 
of a yellowish tint apparently untouched by the stain. The inner 
surface of the gland is ciliated at least near the mouth. A section of 
this gland is shown in text-figure B. The second and larger gland 
