PLATE 13 



EXPLANATION OF FIGURES 



34 and 35 Transverse sections of another 6 mm. toad embryo through the right 

 side of the mid trmik region. Series 54, slide 3, row 3, sections 4 and 10. X 1100. 



REFERENCES 



L, discontinuous anlage of the right P-o., dorsal postcardinal anastomosis 



inferior lateral lymph duct. The b.c, blood cells 



last figure shows the anlage clinging ep., epidei'mis 



to the venous wall w., pronephric duct 



p.m., p.L, medial and lateral post- 

 cardinal divisions 



208 



