PLATE 7 



EXPLANATIOX OF FIGURES 



1.5 Transverse section of a 9 mm. toad embryo through the miildle of the 

 trunk. Series 2, slide 3, row 7, section 2. X 150. 



REFERENCES 



I.S., l.L, superior and inferior lateral p.?«., p.l., medial and lateral divisions 



lymphatic ducts of the postcardinal vein 



r.r., intersegmental vein lo., Wolffian or pronephric duct 



m.s., muscle segment 



16 A small area of a section of a 7 mm. toad embryo through the left mid trunk 

 region. Series 52, slide 3, row 4, section 16. X 1100. 



REFERENCES 



/., anterior tip of a blind anlage of the i.v., intersegmental vein 

 developing superior lateral lymph cp., epidermis 

 duct m.s., mvotome 



196 



