Figs. 43-50 : — ^The ruesoblastic sero-amiiiotic connection at the corresponding stages 

 projected on an imaginary straight line, showing its relative width in different 

 individnals and in different parts of the same individnal. In breadth all 

 are stretched as much as possible, but in length, each represents the shortest 

 distance between the two extremities of the connection. The ends, where 

 the connection is incomplete, are represented by transverse interruptions. 

 Tile black lines in the middle represent the epiblastic sero-amniotic con- 

 nection, their interruptions showing breaks in it. All are magnified to the 

 same extent ( X 10). The connection represented in — 

 Fig. 43 is that of Fig. 7, 

 ,, 44 is from a specimen, 144 hours old. 

 ,, 45 is that of Fig. 8, 

 „ iö „ „ y, 



„ 47 „ „ lü, 



„ 48 „ „ 11, 



49 14 



„ 50 ., „ 19. 



Figs. 51-56 : — Eepreseutations of the perforated states of the sero-amniotic coiniec- 

 tion, as seen from the amniotic cavity. The albumen-sac approaches the 

 amnion as a sort of tube or cave. Albumen is coloured blue. The line AA is 

 the line along which the interallantoic septum is continuous with the imier 

 allantoic limb. The circular line (Amn.) represents a part of the amnion. 

 Differently magnified. The specimen represented in — 

 Fig. 51 is that represented in Figs. 22-26. 

 ,, 52 is from an egg fourteen days old. 

 ,, 53 „ „ fifteen ,, ,, . 



,, 54 is that represented in Figs. 27-31. 

 ,, 55 is irom an egg seventeen days old. 

 ,, 56 is that represented in Figs, 32-36. 



