424 



E. I. WEBBER 



The deformities and great defects (cyclopia) exhibited by 

 both components are due to loss of embryonic substance by the 

 double primordia owing largely to destruction by chemical 

 alteration. The parts surviving this destruction have after 

 regulation developed into two dwarfed, highly defective bodies. 



Fig. 10 'Parasitic' double monster from acetone solution (35 cc. of gram- 

 molecular to 50 cc. of sea water), 14 days old. (Note the protruding, dissociated 

 eyes of the 'autosite'.) 



Fig. 11 Parasitic double monster from acetone solution (35 cc. gram-molec- 

 ular to 50 cc. of sea-water), 14 days old. 



Fig. 12 Dwarfed double monster from acetone solution (25 cc. gram-molec- 

 ular to 50 cc. of sea-water), 15 days old, pc, pericardial vesicle. 



Fig. 13 Mesocatadidymus (?) from acetone solution (30 cc. gram-molecular 

 to 50 cc. of sea-water), 26 days old. 



