134 BULLETIN OF THE 
the short axis (Fig. 12), and much more frequently are placed obliquely, 
as in cell a, Figure 14. We would suppose that, in the event of division 
of an elongated cell with nuclei lying transversely, the cell wall would 
pass longitudinally between the nuclei; but I have not been able to find 
evidence of longitudinal divisions. From the large number of cells with 
nuclei lying obliquely, one would infer that oblique division of the eell 
often took place. I am unable to discover, however, that such is the 
case ; and it seems extremely probable that the divisional plane of the 
cell does not always coincide with that of the nucleus, 
I have found about 25 cells of the serosa with three nuclei. This 
seems to be a matter of individual variation in the make-up of the 
membrane, for all but three of the trinucleate cells were in membranes 
from the brood of a single scorpion, and membranes from some broods 
appear to have none, I have in one instance found a group of tri- 
nucleate cells (Fig. 14, 4, 2, 3, 4). At this spot nuclear multiplica- 
tion has outstripped cell multiplication. It is nearly always easy to see 
which of the two original nuclei has divided, for we find two of the 
nuclei smaller than the third, and nearer to each other than to the 
latter. In cell 2, for instance, the pair of nuclei on the left have arisen 
from a nucleus occupying a position about midway between them. The 
same statement would doubtless hold true for the two nuclei on the right 
in cell 3, and here the odd nucleus is elongated. When the cell is long 
and the nuclei all lie in the longitudinal axis, as is the case in cell if. 
it is usually impossible to determine which of the two original nuclei 
has divided ; for the nuclei are equidistant, and nearly alike in size. 
Another type of equidistant nuclei is shown in cell 4, — a distribution 
quite as characteristic of very large, broad cells as the linear arrange- 
ment is of elongated cells. I have spoken of the division of one of the 
two original nuclei as though it always took place after the nuclei were 
completely separate, and had taken their positions in the cell. This 
seems to be the usual method, for I have several times found one of 
the original nuclei in the act of dividing. But it is possible, of course, 
for thern to arise by a tripartite division, in which the three nuclei 
would be formed simultaneously. I have found only one instance of 
a true triple division, represented in Figures 29 and 30, and as this 
occurred in a serosa which had plainly undergone degencration, I do 
not consider it as altogether normal. It will be noticed that the origi- 
nal nuclens became trilobed, and that the lobes became daughter nuclei 
of approximately equal size by the formation of three divisional planes, 
mecting at the centre of the original nucleus, The daughter nuclei on 
