Castle. — Cioua iutestiualis. 



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 J> s -^ 

 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 Z) 7 - 6 and D 9Ai should be stippled like their mates. 

 In Fig. 67, the cell C' 7 - 11 should be c 7 - 11 . 



