28 CHIKANOSUKE OGAWA 



C II. The vesicle is slightly oval The ventral wall is thick. No 

 accurate criteria are obtainable. 



C III. Vesicle round. Lateral wall thick. Probably no rotation 

 has occurred. 



Examination 30 hours after operation. 



A I. Vesicle oval in form: ventromedial w^all thick. Rotation is 

 probably complete. 



A II. (fig. 14). Vesicle large and oval. The wall is thick dorsally. 

 The ganglion is attached to- the lateral wall. Rotation has not yet 

 occurred. 



A III. The vesicle is relatively small and round. The wall is thick 

 dorsomedially. No rotation has occurred. 



B I. Vesicle oval in form. The lateral wall is thin and shghtly flat. 

 Rotation is probably complete. 



B II. Vesicle round. Ventromedial wall fairly thick. Rotation 

 complete. 



B III. Vesicle round. The difference in thickness of the walls is 

 insignificant. The ganglion is attached to the ventromedial wall. 

 Rotation is probably complete. 



C I. Vesicle Avell developed and oval in form. The dorsal wall is 

 thick. The ganglion is attached to the lateral wall. No rotation. 



C II. This vesicle from some cause is not closed and opens laterally . 

 The opening doubtless represents the lateral wall. Wall is thickest 

 ventromedially. Rotation is complete. 



Examination 34 hours after operation. 



A I (fig 15). The thinnest part of the wall turns toward the brain, 

 the thickest ventromedially. Rotation is complete. 



A II. Vesicle large and oval. Ventromedial wall thick. Rotation 

 complete. 



A III. Vesicle oval. The ventral wall and the lower part of the 

 medial wall are thick. General appearance distinctly suggests rotation. 



B I. Vesicle is too small for study. 



B 11. Vesicle well developed. Position difficult to determine. 



B III, The vesicle is round. Ventromedial wall thick. Ganghon 

 attached to upper part of medial wall. Rotation is complete. 



C I (fig. 16). Vesicle slightly oval. The ventromedial wall is thick. 

 Rotation complete. 



C 11. Proper criteria lacking. 



