MEROGONY AND REGENERATION : IN RENILLA. 



223 



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colony that seems exactly comparable to that existing between 

 the different organs of a single individual - -essentially the same 

 result as that given by the formation of dwarf colonies from egg 

 fragments. 



I endeavored to see whether, by removing all the buds except 

 the exhalent zooid, this](rudimentary person could be made to 



G 



FIG. 4. Regeneration after oblique section. A, outline of colony (contracted) 

 with six pairs of buds, showing plane of section. B, anterior piece, four hours after 

 operation ; after twelve hours the wound had entirely closed. C, the same forty- 

 eight hoars after operation, showing rudiment of peduncle. D, the same five days 

 after operation ; return of lateral bud to its original position. E, posterior piece, 

 twenty-four hours after operation ; lateral bud in the former position of the axial polyp. 

 /", the same twenty-four hours later; new axial polyp (A'j forming. G, the same, 

 seven days after operation ; new axial polyp well developed, with new exhalent zooid ; 

 return of lateral bud nearly to its original position. During the following ten days 

 the axial polyp became as large as the lateral one, but no other buds were formed. 



