302 



WATASE. 



EXPLANATION OF PLATE XII. 



Loligo Pealei. 



All the figures in this plate have been magnified 65 diameters. 



Fig. 28. A blastoderm with 32 cells. The left half is ahead of the right half in 

 the progress of division. 



Fig. 29. A blastoderm consisting of 32 cells. This specimen shows a pair of 

 peculiarly fused areas which are symmetrically arranged on both sides of the median 

 furrow of cleavage. 



Fig. 30. A blastoderm consisting of 60 cells. The left-hand side of the blasto- 

 derm is further advanced than the right side. 



Fig. 31. A blastoderm consisting of 90 cells. In this specimen, the right-hand 

 side is further advanced than the left half. 



Fig. 32. A blastoderm consisting of 116 cells. The left half ahead of the right. 



All the specimens represented in Figs. 28, 30, 31, and 32 have been obtained from 

 the eggs of the same squid. 



