32 



WILLIAM A. LOCY AND OLOF LARSELL 



CervSc M. P^'IAt. 



R.D.B. 



Pul.At, 



LD.B. 



64 



Fig. 63 Dorsal aspect of the lung of an embryo of the ninth day, showing the 

 lane-like area of capillaries extending from the cranial to the caudal part of the 

 lung. 



Fig. 64 Sketch from an embryo at the close of the fourteenth day of incuba- 

 tion to show the way in which the persistent right half of the fourth aortic arch 

 and the two halves of the sixth arch join the aorta. The pulmonary artery is 

 small. Drawn bv G. H. A. Rech. 



