388 JOHNS HOPKINS UNIVERSITY MORPHOLOGICAL MONOGRAPHS. 



PLATE XLV. 

 SALPA PINNATA AND SALPA HEXAGONA. 



Figure 1, a longitudinal section through the placenta of the embryo of Salpa 

 hexagona at a very early stage. 



Figures 2, 3 and 4, transverse sections through three embryos of Salpa hexagona, 

 at three successive stages. 



Figures 6 and 7, sections of young aggregated salpse of Salpa hexagona from a 

 stolon ; N, the eggs. 



Figure 5, a transverse section through the endostyle and stolon of Salpa pinnata, 

 at the stage shown in Plate XLI, Fig. 5. 



PLATE XLVI. 

 SALPA PINNATA AND SALPA AFRICANA. 



Figures 1 and 2, two longitudinal sections through an advanced stolon of Salpa 

 pinnata, to show the changes in the positions of the salpse. 



Figui-e 3, a more enlarged figure of the sections and 7 of cut Y on page 107. 



