CASTLE. — Ciona intestinalis, 
PLATE X. 
Figs. 57-62. Surface views of preparations ; magnification, 560 diameters. 
Fig. 57. 48-cell stage, viewed from behind. 
Fig. 58. The same egg and stage, viewed from in front. 
Fig. 59. 64-cell stage, ventral view. 
Fig. 60. The same egg and stage, dorsal view. 
Fig. 61. 76-cell stage, ventral view. 
Fig. 62. The same egg and stage, dorsal view. 
Note. — Consult general statement under Explanation of Plates. The cell D6 
and its mate in the left half of the Figure were stippled by mistake. 
Figs. 63-70. Eight cross-sections from a series through an embryo in late 76-cell 
stage; magnification, 560 diameters. For position of sections in em- 
bryo, see horizontal lines 63-70 in Fig. 62. 
Note. —In Fig. 63, the cells D7-5 and D*-4 should be stippled like their mates. 
In Fig. 67, the cell 07-11 should be cer, 
