216 
FOURTEENTH REPORT. 
EXPLANATIONS OF FIGURES. 
(Abbreviations used.) 
a — nerve cord, 
b — notochord, 
c — Wolfian duct, 
d— sex gland. 
e — alimentary canal (gut), 
f — germ cell, 
g — body cavity, 
h — aorta. 
i — opening due to shrinkage, 
j — ectoderm, 
k — mesoderm. 
1 — entoderm, 
in — periblast layer, 
n — periblast nuclei, 
o — yolk granule. 
Figures 1-12 are from microphotographs made by the author, illustrat- 
ing the successive positions of the germ cells from the 
sex glands to the lateral and dorsal Avail of the gut 
entoderm. 
Portion of a cross section of embryo lOoAb thru© the sex 
glands (d). Length of embryo S.6 mm. 
Portion of Fig. 1 more highly magnified, showing a germ 
cell (f) in the sex gland. 
Portion of a longitudinal section of embryo 93Aa thru 
the sex gland (d), showing several germ cells (f). 
Length of embryo 5.75 mm. 
Portion of a longitudinal Section of embryo 105Aa sliow- 
Figure 1 
Figure 2. 
Figure 
Figure 4. 
ing germ cells (f) in the sex gland. Length of embryo 
8.4 mm. 
Figure 5. 
Portion of a cross section of embryo 105Ac thru the sex 
gland (d), showing a germ cell (f) at the neck of 
the gland. Length of embryo 8.G mm. 
Figure fi. Portion of a cross section of embryo 90 Aa thru a region 
showing a germ cell (f) in the germinal ridge just 
ventral to the Wolfian duct (c). Length of embryo 
4.75 mm. 
Figure 7. Portion of a cross section of embryo 90Aa, showing 
germ cells (f) in the germinal ridge and also in the 
mesentery supporting the ailmentary canal (e). 
Figure 8. Portion of a crosss section of embryo 84Ba showing a 
germ cell (f) in the mesotherium just dorsel and to 
the left of the gut entoderm (e). Length of embryo 
3.5 mm. 
