300 



ARTHUR WILLIAM MEYER. 



in the formation of the amniotic cavity, this pathologic chorionic 

 vesicle is of special interest also in the absence of coagulum or 

 so-called magma. The chorionic vesicle and the space taken 

 for the amniotic cavity were filled with perfectly clear fluid. 

 Although this small conceptus is markedly macerated it is 



FIG. 8. Section through the chorion, amnion (?) and yolk sac of No. 1843 at 

 the point of attachment. The small nodule of cells above (2) may be a remnant of 

 the primitive streak or of the allantoic stalk. X 69. 



only in the eaily stages of disintegration . Nevertheless, much 

 longer retention might have resulted in its complete dissolution 

 even if not its complete absorption. Since this small vesicle was 

 aborted in its entirety with blood clot, it is highly probable that 

 most of these degenerative changes occurred after it was loosened 

 from the implantation site, probably by rupture of the decidua 

 capsularis in consequence of hemorrhage. 



In other older conceptuses in earlier stages of disintegration, 



