Journ. of Morph., Vol. XIV. PLP: 
Fics. 11 AND 12. — Outline and section of a pig's embryo 23 mm. long. A&., rectus; 7.7, 
internal mammary artery. 
Fics. 13 AND 14. — Outline and section of a pig’s embyro 33 mm. long. #., rectus; 7.47, 
internal mammary artery. A superficial vessel S., which runs along the milk line, is 
shown in sections. This vessel is a vein, and can be seen beautifully in the living 
specimen. 
Schmidt del. 
