Castle. — Ciona intestinalis. 



PLATE IX. 



Surface views of preparations ; magnification, 400 diameters. 



24-cell stage, ventral view. 



The same egg, in the same stage, dorsal view (cf. Plate VII. Figs. 43 



and 44). 

 32-cell stage, ventral view. 

 The same egg and stage, dorsal view. 

 46-eell stage, ventral view. 

 The same egg and stage, dorsal view. 



