DEVELOPMENT OF SPELERPES BILINEATUS 



181 



represents the beginning while fig. 76 shows later changes. The 

 following day the cleavage was indistinguishable from ordinary 

 eggs. A normal embryo finally resulted. Another type called 

 'Barock furchung' by Hertwig, previously noted by Born ('86), 

 is shown in fig. 9, h representing a later stage of the same egg, 



Figs. 5-9 



shown at a. Although this egg died after developing two days, 

 others have given normal embryos. A large number of cases of 

 this type were seen in a bunch of eggs placed in a very small 

 bottle before cleavage and carried about in my pocket for half 



