254 



CHARLES R. STOCKAKO. 



TABLE I. Continued. 



Each specimen was operated upon twice as indicated. R and L following 

 the specimen number signifies right and left sides of the animal; G indicates the 

 great and S the small first chela; x indicates the appendages removed and r the 

 appendages regenerated. 



THIRD SERIES. 



Finally, an attempt was made to determine how large a portion 

 of the great first chela might be removed without causing it to 

 regenerate small; or to cause the small chela of the opposite 

 side to grow into the great type. When a large portion of the 

 chela was quickly clipped off with sharp scissors or a knife the 

 remaining portion was soon thrown off at the breaking joint. 

 The only successful operations consisted in the removal of the 

 dactylus or most distal segment which forms part ol the claw, 

 and in the removal of the entire pinccr or dactylus and distal 

 end of the propodus, as is indicated by the lines drawn across 

 the chela in Fig. i, C. In the last case a stump-like appendage 

 without a pincer remains. 



Following either of these operations the great chela was fully 

 reformed or renewed at the next moult, no reversal taking place. 



A small portion of the great chela may then be regenerated in 

 its original form. \Yhrn tin entire 1 chela is removed the small 

 chela of the opposite side- invariably grows into a great chela 

 and a small chela regenerates from the stump of the orii'.inal 

 great one. This reversal of asymmetry may be shifted back and 

 forth for a number of times and occurs in a manner as decidedly 

 pronounced after several operations as it does after the first. 



