CASTLE. — Ciona intestinalis, 
PLATE XI. 
Magnification of all Figures, 560 diameters. 
Fig. 71. 112-cell stage, dorsal view. 
Fig. 72. Early gastrula, dorsal view. 
Figs. 73-77., Five cross sections through an early gastrula (128-cell stage). For 
position of sections in embryo, see horizontal lines 73-77 in Fig. 72. 
Note. — Consult general statement regarding lettering under Explanation of Plates. 
Fig. 78. Sagittal section through an early gastrula (older than that shown in 
Hig, 12). 
Fig. 79. Similar section through a slightly older stage. 
Fig. 80. Surface (dorsal) view of late gastrula. 
Figs. 81-83. Three horizontal sections from a series through a late gastrula. 
