S6S ORR. ' [yOL.I. 



Plate xiv. 



Figs. 24, C, 39, C incl. —The figures represent, in the order of succession, 

 a series of sections at ahnost regular intervals, through the head and anterior 

 part of the body of the embryo figured at 2, C, PI. XII. They are cut in the 

 plane denoted by the line P-S (see Fig. 2, C) at right angles to the sagittal 

 plane of the embryo. This same series is continued in Figs. 40, C, 41, C, 

 and 42, C, on Plate XV. v, denotes the cardinal veins, uniting at v (Fig. 

 38, C) in the ductus cuvieri. v', marks the hepatic veins in Fig. 40, C, 

 which are continued from the mesenteric and vitelline veins, v' , Fig. 41, C. 



For the other parts see Register of Index-letters. (Z. 2. obj. i inch, 

 Browning.) 



