72. C. M. Child 
70 Pol 
Figs. 7 to 11 Lateral operations and their results in partially invaginated animals: in longitudinal 
section. 
Fig. 7 Operation on slightly invaginated animal. 
Fig. 8 Result of operation: the heteromorphic tentacles are located at a, within the cesophagus. 
Fig. 9 Operation on individual more completely invaginated. 
Fig. 10 Early stage following operation of Fig. 9: a and b indicate the regions of union of cut 
margins of body wall and cesophagus. 
Fig. 11 
Later stage of same individual: heteromorphic tentacles appear on the upper surface near 
the original oral tentacles. 
