FROM TWELVE TO THIRTY-SIX SOMITES 1 
Peay 
3S x 
= 
a 
Oe 
s 
ae, 
suo: 
— 
ae 
Bans 
n 
Oo g 
ae) 
wes 
ai as 
Os 
GS 
oo ed 
S| 
o 5 
o R 
an 
= 2 
8 8 
are 
ey 
ro) 
= 
La 
~_ 
o~ 
eS) 
oO 
= 
=) 
mM 
is 
Neph. T., Nephrogenous t 
My’c., Myoccel. 
Fic. 109. — Transverse section through the twentieth somite of a 29s embryo. 
Am. F., Amniotie fold. 
