344 CHIKANOSUKE OGAWA 
one partially. Occasionally a part of the cell extends over the 
capillary and sometimes the whole cell rests upon it. In cases 
where a small cell covers a part of an intercapillary space, it is 
located not in the middle of the space, but eccentrically against 
the capillaries, and is generally elongated in its shape, the border, 
which is in contact with the capillary, being naturally outwardly 
convex, and the opposite border, curving inwardly, so that the 
cell is somewhat crescent-shaped and is always slightly narrow 
at the ends (right, above fig. 7). When two small cells are to- 
gether, their relation to the capillary is the same as that of a 
single cell. The boundary line between these two cells is nearly 
straight. When they entirely fill an intercapillary space, the 
shape of the two cells is adapted to the space, being more or less 
round, in case they occupy only a part of the space their short 
edges are in contact with each other and corresponding the curva- 
ture of the capillary, they are horseshoe-shaped, or, if somewhat 
narrowed at the boundary line, they have the form of an hour- 
glass. Groups of three cells present, as a whole, a round, elon- 
gated, or horseshoe-like form. 
The small cells which fill up an intercapillary space vary usually 
from one to three, in rare cases they amount to more than ten. 
The large cells are also flat, their borders not being straight, 
like those of Clemmys, are more or less curved, and though the 
form of the cell is irregular, it might be described at times as 
pentagonal or hexagonal. As the diameter of the large cells 
are four or five times as long as those of the small ones, the 
difference in their sizes is considerably less than is the case in 
Elaphe. The large cell, unlike the small cell, never presents an 
elongated form and invests either a whole intercapillary space 
or both the space and the capillary, in which case the cell extends 
over the capillary to the edge of a neighboring intercapillary 
space and there meets the cell of that space; that is to say, the 
cell is bounded by the contour of the capillary; but in some 
instances the cell extends over into an adjacent space. 
In Clemmys and Elaphe, the nuclei of the flat cells, as above 
mentioned, could not be demonstrated by means of the usual 
impregnation with silver, but those of the small cells were easily 
