SEX-CELLS OF AMIA AND LEPIDOSTEUS 9 
Gutentod ern .0 <7 ql de cae 128 
Mesoderm of intestinal wall and 
MERCMLENY 1 is.ge ee uk eae es 222 > 387 outside of sex-gland anlagen. 
Root of mesentery between 8. G. 
anlavenis: i. chageeetig serene 37 
Right sex-glam dls. sot hecsas eae 
197 \350 in sex-gland anlagen. 
ett nexer land ..n s24.ce cee 153 f 
There is a strikingly close correspondence between the results 
of the count in this specimen and those in the preceding one. 
Attention may be called to the fact that in this specimen a 
materially greater number of sex-cells is found in the right sex- 
gland than in the left. At the same time there is a very close 
correspondence in the total number of sex-cells that have reached 
the sex-gland anlagen as compared with the total number in the 
12.0 mm. stage (359). 
Lepidosteus 17 mm. total length. In this specimen those sex- 
cells destined to occupy the sex-glands are seen to have migrated 
some distance to each side of the root of the mesentery, fig. 11. 
Their position relative to the root of the mesentery and to the 
Wolffian duct varies at different points along the sex-gland 
anlage. In the most cranial portion of the latter they le just 
medial to the Wolffian duct. As one follows the sex-glands 
caudally, the sex-cells are found to lie closer and closer to the 
mesentery, being situated midway between the latter and the 
Wolffian duct in the middle region of the sex-gland anlage. The 
most caudally situated sex-cells lie close to the root of the mesen- 
tery. 
In this and the succeeding stages the intestine had become so 
voluminous as to make the counting of the sex-cells in its walls 
very difficult and inaccurate. It is in fact not easy to distin- 
guish them from the cells of the gut entoderm because of their 
rather small size and their entire lack of yolk material at this 
stage. 
The total number of sex-cells in the sex-gland anlagen of this 
specimen is rather high, there being 235 in the left sex-gland and 
262 in the right. The total number is 497. 
