FGETAL MEMBRANES. 



129 



accepted facts, referring the student to special articles on the subject for further 

 details. 



In the fully developed placenta, the chorionic villi lie either free (floating 



-villi) or attached to the decidua (fastening villi) in what are known as inter- 

 villous spaces (Fig. 113). In sections the villi are, on account of their structure, 



