Plate XV. 



(For explanation of abbreviations and colours see p. 370.) 



Figs. 1-5 : — Dorsal' views of embryos in different stages from 48 to 78 lionrs. The 

 sero-amniotic connection in — 



Fig. 1 is represented apart in Fig. 38, 

 )> ^ 11 ■>■> It "") 



11 " )) 11 11 ^^j 



4 41 



11 ^ 11 11 )) ^'-i 



„ 5 „ „ „ 42. 



Figs. 6-9 : — Dorsal views of embryos in different stages from 104 to 168 hours. The 

 embryo proper and the splanchnic mesoblast are left out. The serous envelope 

 is also for the sake of simplicity not represented. The sero-amniotic con- 

 nection in — 



Fig. 7 is represented apart in Fig. 43, 

 „ 8 „ „ 1, 45, 



„ 9 „ „ „ 46. 



Figs. 10-11 :— Tlie first is the surface view of an egg taken out from its non-cellular 

 enveIo[)es, and the second of the vicinity of the sero-amniotic connection in the 

 same egg. The sero-amniotic connection has a peculiar fish-like shape. 

 The anterior i)art of the sero-amniotic connection is in this specimen 

 exceedingly elongated dorso-ventrally and being bent down on the plane of 

 the paper appears t)'iangular, looking like the tail fin of a fish. The connec- 

 tion is thus twisted at the point A. The sero-amniotic connection is repre- 

 sented apart in Fig. 47. 



Figs. 12-13 : — The first is a surface view of an egg taken out from its non-cellular 

 envelopes, and the second oï the vicinity of the sero-amniotic connection of 

 the same. The amniotic cavity, the cave-like diverticulum and the three 

 allantoic septa are represented l)y dotted lines. In the second the area 

 F' E' M F' represents a part of the interallantoic septum and the space 

 CBAD the cave-like diverticulum beneath the overlapping allantoic lobe. 

 The sero-amniotic connection is represented isolated in Fig. 48. 



Fkss. 14-16 : — Fig. 14 is a surface view of an egg taken out from its non-cellular 

 envelopes; Fig. 15 an outline of the ibetal meml)ranes ; and Fig. 16 a surface 



