CYTOPLASMIC INCLUSIONS OF THE GERM-CELLS. 435 
processes to disappear partly or wholly, just as these solutions 
sometimes affect the pseudopodia of protozoa. Freshly teased 
preparations of testes failed to show any movement of either 
flagella or cell process, even though a warm stage was used. 
The Spindle Bridge (Le reste fusorial). 
The secondary spermatogonia and young spermatocytes and 
the secondary oogonia and young oocytes are connected one 
with another by spindle bridges. Such structures are well 
known and need not detain us longer than necessary to draw 
attention to some peculiar facts worthy of notice. In PI. 25, 
fig. 46, I have depicted a nest of secondary spermatogonia of 
Euchelia jacobaese, showing the spindle bridges (S.B.), 
the mitochondria (M.D.), and curious interconnecting bridges 
of mitochondria joining the main mass of granules ( M.D .) 
with the spindle remains. These peculiar interconnecting 
structures ( I.B.M.D .) are always present and remarkably clear 
in Flemming fixing material. At this stage the spindle bridges 
stain very darkly with iron hasmatoxylin, showing that they 
are very dense. When the spermatogonia enter^ the growth 
stage as young spermatocytes the protoplasmic bridges are 
not at first broken, but all the cells have common spindle 
bridges. As the lumen appears in the middle of the nest of 
cells the bridges become attenuated, and a central darker 
part in the cell is connected to the central darker part of its 
fellow’s spindle bridge by a paler structure. Soon the cells 
become as large as shown in PI. 25, fig. 45, and towards the 
end of the prophases the cells are interconnected by a very 
small, rapidly dwindling bridge ; in PI. 25, fig. 45, the bridges 
are at a stage when interconnecting parts between cells (I.P.) 
are very distinct, and these parts will probably soon break 
asunder. The cell is left with the central dark part ( C.D.P .) 
which in the male soon disintegrates. Iu the female moth 
the fate of the spindle bridge is different. I have not 
described the case of the female because this has been done 
by Miss Pauline H. Dederer in the f Journal of Morphology/ 
