HUBRECHT. Pl. Z. 
TS 
fay LI 
aaa 
Fig. 124. Transverse section 
of the right half of an early embryo- 
nie shield of Torpedo (after Riickert 
and Molier, ‘06). The participation 
of a region of entoderm az towards 
the formation of blood and blood- 
vessels is here indicated. — Fig. 125. 
Longitudinal section of Lepidosiren 
(after Graham Kerr, 01). ef. Amphi- 
bia (Fig. 79). pp protochordal plate, 
pw protochordal wedge. — Fig. 126. 
The dorsal raphe (dorsal mouth, ,,Riik- 
kenrinne“) dz of Ceratodus seen from 
above (after Semon). Fig. 127 and 
128. Two diagrammatic longitudinal 
sections of stages in the notogenesis 
of Amphibia (after Ziegler, “02). p/ 
protochordal plate, fw protochordal 
wedge, vm ventral mesoblast. 
