Castle. — Ciona intestinalis. 
PLATE VIII. 
Six successive views (obliquely from the left, above, and behind) of a living egg; 
magnification, 315 diameters. Arrows indicate the direction of spindles. 
Fig. 45. 2cell stage. x, region of finely granular protoplasm (cf. description of 
Plate III. Fig. 17). 
Fig. 46. 4-cell stage, just formed. 
Fig. 47. 8-cell stage, approaching. 
Fig. 48. 8-cell stage, fully formed (viewed as a transparent object). 
Fig. 49. 16-cell stage. 
Fig. 50. 24-cell stage. During the formation of the 24-cell stage, the egg has 
rotated so that the view is almost exactly dorsal. 
