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E. A. BAUMGARTNER 



shown an increased cranio-caudal diameter, although the trans- 

 verse is still the greater. The cystic duct here projects more 

 to the left, still somewhat dorsally and slightly backward. 

 The cranio-caudal diameter increases rapidly from now on, and 

 the position of the cystic duct would indicate that there is a more 

 rapid caudal growth. Figure 23 shows the model of a gall- 



Fig. 21 Transverse section of an Amblystoma embryo 9 mm. long, taken 

 in the region of the gall bladder. X 30. D.chol., ductus choledochus; F.g., 

 foregut; D.cy., cystic duct; G.b., gall-bladder. 



Fig. 22 Sagittal section of an embryo 12.5 mm. long. X 30. F.g., foregut; 

 G.b., gall-bladder; Li., liver. 



Fig. 23 Drawing of a model of the gall-bladder of an Amblystoma 14 mm. 

 long. A, anterior view; B, left lateral view. X 40. 



bladder of an embryo almost 14 mm. long. The cystic duct 

 attached near the anterior end, projects to the left and dorsally. 

 In two graphic reconstructions of embryos 13 and 13.5 mm. 

 in length respectively (figs. 18 and 19), the gall-bladder is at- 

 tached by a short and constricted cystic duct to a radicle of the 

 right hepatic duct. In figure 18 the cystic duct leads from the 

 anterior dorsal end of the gall-bladder to the left, caudally and 



