526 L. S. ROSS 
altogether different from that obtained by the observation of 
a single section. Figure 10 shows a section of a motor cell of 
a crayfish that had been dead several hours before fixation of the 
tissue. Some peripheral vacuolation is evident. The tropho- 
spongium appears in section as fibers extending into the cell 
body. Figure 11 is of a section of the same cell between the 
center and the periphery.’ This shows in cross section some of 
the capsular processes that divide the cytoplasm into irregular 
lobes. Figures 1 to 9 show photomicrographs of nine sections 
of one cell. In these the anastomosing walls and the capsules 
are very evident. The sections are 4 micra in thickness Figure 
1 is of the third section from the periphery, figure 2 of the fourth, 
figure 3 of the fifth, figure 4 of the eighth, figure 5 of the eleventh, 
figure 6 of the twelfth, figure 7 of the seventeenth, figure 8 of the 
twenty-third, and figure 9 of the twenty-fourth section. The 
total number of sections of the cell in the series is thirty-two. 
Others of the series would serve almost as well for illustration 
as those selected. A cursory examination shows the continuity 
- of the trophospongium with the surrounding cell capsule. In 
figures 2 and 3, a nucleus is evident in one of the trophospongic 
walls at its connection with the cell capsule. This is the only 
nucleus observed in the trophospongium in the large number of 
sections studied. While some of the trophospongic walls are 
rather thick and heavy, the greater number are relatively thin 
and delicate, being only a few fibers in thickness. The con- 
tinuity of the fibers with the cell capsule can be readily deter- 
mined in sections 10 micra in thickness stained in Mallory’s con- 
nective tissue stain following Zenker’s fixation. Some of the 
fibers take on a red color, others blue. 
R. Legendre suggests that the trophospongium is rarely present 
in the normal animal and that it may be characteristic of a patho- 
logic condition. The suggestion is based upon his own obser- 
vations, as he seldom found the structure in normal specimens 
but found it more abundant in the pathologic. This is not in 
accord with my observations upon the crayfish. In numerous 
sections from normal animals the trophospongium was found 
