Journ. of Morph., Vol. XIV. Pi: A 
Fic. 1.—Profile view of embryo XII two weeks old. Enlarged 38 times. A.z., amnion; U.I’., 
umbilical vesicle ; a.v., auditory vesicle ; 0.v., optic vesicle ;O.3, third occipital myotome ; 
C.8, eighth cervical myotome; /7., héart ;..0.7z., omphalomesenteric vein; JZ2#., mem 
brana reuniens. 
Fic..2.— Profile view of embryo II four weeks old. Enlarged 10 times. The myotomes of 
the dorsal region have been added from the sections. ¢, 72, fourth and twelfth dorsal 
myotomes. 
Broedel and Mall ded. = 
