ox THE FOETAL MEMBRANES OF CHELONIA. 



47 



Fig. 41a, DiagTammatic longitudinal section of a Clemmys embryo 

 somewhat older than that o;iven in Fig. 41. 



Plate. VI. 



Figs. 42-47. Selected transverse sections from a Clemmys embryo 



6 days old with 20 mesoblastic somites. CC x 1. '^^^"•> 

 Figs. 44a. Median dorsal part of the Amnion in Fig. 44. under a 



higher power. D.Z) x 4. 

 Figs. 48-49. Selected transverse sections from a Clemmys embryo 

 9 days old. CC x 1. 

 Fig. 48. From the tail-region. 

 ' Fig. 49. From the dorsal region. 

 Fig. 48a. Median dorsal part of the Amnion in Fig. 48. under a 



higher power. BD x 4. 

 Fig. 49a. Median dorsal part of the Amnion in Fig. 49. under a 



higher power. DD x 4. 

 Figs. 50-52. Selected transverse sections from the embryo repre- 

 sented in Fig. 17. CC X I. 

 Fig. 50. From the region of the lateral limbs of the Amnion. 

 Fig. 51. From the dorsal region of the Amnion. 

 Fig. 52. From the region when the head is sunk almost entirely 

 below^ the level of the blastodem. 

 Figs. 53-55. Selected transverse sections from the posterior tube of 

 the Amnion in the embryo represented in Fig. 24. Only 

 the epiblast and somatopleuric mesoblast are represented, 

 the hypoblast and splanchno})k'uric mesoblast being 

 omitted. DD x 4. 

 Fig. 53. Near the posterior opening of the tube. 



