86 The Rete-Cords and Sex-Cords of Chrysemys 
fundament, in fact they are found for a short distance anterior to it 
Naturally each funnel-cord lies opposite a primary Malpighian corpuscle, 
and likewise to the series of secondary, tertiary, etc., corpuscles formed in 
a vertical row above it. Each cord is made up of rather loosely arranged 
cells that bear a rather close resemblance to the mesenchyme cells. In 
fact the nuclei of these cells, the funnel cells, and the cells of the’ perit- 
oneum are not to be distinguished from one another. Cytoplasmic differ- 
ences alone appear and these depend upon the density of the tissue. In 
some cases a slight evagination of the capsule of Bowman is found at 
the point where it joins the peritoneal funnel. This evagination may 
take various forms and in many cases is wholly absent. Such an appear- 
ance may have led to the view held by some authors that these cords 
arise as outgrowths from the capsules of Bowman. This view would be 
still further justified if the peritoneal funnel were to break away from 
the peritoneum at a stage prior to that observed. There can be no 
question, however, but that the funnel-cords are outgrowths from the 
peritoneal funnels; in fact their bases are the funnels themselves. 
The distal portions of the funnel-cords lie above the vena cava in the 
fundament of the adrenal body, contributing the greater part of the tissue 
that in later stages constitutes the cortical substance of that gland. Perit- 
oneal ingrowths may also be seen extending dorso-laterad from the 
peritoneum at a point near the base of the mesentery to the adrenal fun- 
dament. These also contribute to the cortical tissue of the adrenal body. 
They are of less regular occurrence than the funnel cords, and in later 
stages lose their connection with the peritoneum, although they are easily 
distinguishable in the stage of 7 mm. C-7’. length. 
The sex-gland can be clearly distinguished in the embryo of 6.8 mm. 
C-T. length. It extends through six somites, although the last 4 of it 
remains in a rudimentary condition. Even in this stage it consists 
merely of thickened peritoneum containing scattered primitive sex-cells 
(Ureier). 
The sex-gland develops from a portion of the germinal epithelium lying 
between the bases of the funnel-cords and the base of the mesentery. In 
the embryo of 6 mm. C-7'. length, a few primitive sex-cells were already 
beginning to appear in this region. At this time, the V. renalis revehens 
(vena cava) les close above the germinal epithelhum which has not yet 
begun to thicken to form the sex-cords. In an embryo of 6.8 mm. C-T’. 
length the germinal epithelium has sent out masses of cells towards the 
VY. renalis revehens, and has at the same time bent outward in such a 
manner as to form in transverse section, the periphery of a semi-circle, 
the interior of which is occupied by the sex-cords. The tips of the sex- 
