Journ. of Morph., Vol. XLV. PAs: 
Fic. 3. — Section through the fourth dorsal myotome of embryo II. Enlarged 40 times. On 
one side the muscle bud, J7.2.,is shown. A., aorta; /.W., foramen of Winslow; Z., 
liver; A., heart. 
Fic. 4.— Embryo XLIII. Enlarged 5 times. The position of the rectus is well shown 
Schmidt del. 
