76 OTTO F. KAMPMEIER 
v.jug.ext.dex. 1 &.car. ext. dex.) &. cat ext. sin. 
lym. 
: acat: ext. dex.et sin. : 
«> at oS ; 
yay ~~ my : s 1 \ym. i, 12, ‘ A nt Fe *- “s ay | lym. Pet %, 
Fig. 11 Photomicrograph of a transverse section through the ventral cephalic 
region in a 7-mm. embryo of Bufo vulgaris (K. E. C., series B 27, slide 1, section 
100). X 290 (Leitz 4-mm. Obj. and Zeiss Compensat. Project. Oc. 4). a. car. 
ext. dex. and sin., arteria carotis externa dextra and sinistra; v. jug. ext. dex., 
