SEX-CELLS OF AMIA AND LEPIDOSTEUS is 
Amia 3.7 mm. total length. The conditions are, in the main, quite 
similar to those found in the 4mm. stage. Inoneof the two speci- 
mens (B) in which the sex-cells were counted there were 92 sex- 
cells in the mesoderm and 10 in the entoderm. Although this 
total number of 102 is greater than the number found in the 4 
mm. stage (87), yet, as shown in table 2, no significance is to 
be attached to this on account of the great individual variation 
in the number of sex-cells observed, not only in Amia, but also 
shown by the author to be so obvious in the turtle, Chrysemys. 
In A of this stage, 72 sex-cells were found, 42 on the right and 
30 on the left side. 
Amia 3.6 mm. total length. Two larvae of this stage were stud- 
ied. It was rather difficult to measure the specimens accurately, 
owing to the fact that the caudal portion of the body free from 
the yolk has a strong ventral bend. It can be straightened out 
only in later stages. The two specimens of this length were taken 
from the same nest and both are distinctly younger than the pre- 
ceding, yet they showed decided differences from one another in 
the positions occupied by the sex-cells, probably owing to the 
fact that this, in all likelihood, is the period of their most active 
migration. In specimen A the sex-cells are quite numerous in 
the portion of the lateral plate of mesoderm, which lies imme- 
diately above the border of the subgerminal cavity. They occur 
in fair numbers in the mesoderm between this region and a point 
one-half the distance from this point to the median edge of the 
lateral plate of mesoderm. Only three were found nearer the 
median line than this. Of these, one had scarcely passed the 
midway point, one was still some distance from the median edge 
of the lateral plate, while one had actually reached that point. 
In specimen B of this stage a large proportion of the sex-cells 
have reached the median edge of the lateral plate of mesoderm 
of each side. This is especially noticeable on the right side. The 
conditions in this specimen approach those described for the 4 mm. 
stage but do not show quite such an advanced condition, owing 
to the fact that a larger proportion of sex-cells are scattered along 
the outer portions of what we may call the sex-cell path. There 
