REVERSAL OF ASYMMETRY IN ALFHEUS. 



2O5 



G 



D 



F 



1 



J 



FIG. 3. Normal reversal, and partial inhibition of the reversal after section of 

 nerve of small chela, X4- 



A, B, C. Double reversal after two successive amputations of large chela. A. 

 Cast skin of right chela, female, first moult, nine days after removal of left large 

 chela. B. The same appendage amputated three days after moult. C. Appendage 

 regenerated on the same stump, immediately after the second moult, six days later ; 

 restoration of the original condition. The left chela is again of the large type. 



D, , F. Partial inhibition of reversal by section of the nerve of the small 

 chela after removal of the large one ; originally right-handed male. D. Cast skin 

 of small chela at moult, nine days after operation. E. The same appendage with- 

 drawn from the cast at" the moult. F. The right chela, showing distinct features of 

 the large type. 



G, H. Partial inhibition of reversal after section of nerve. Originally a right- 

 handed female. G. The small chela, fourteen days after operation ; no moult. //. 

 Chela of large type regenerating on stump of large chela removed. 



/, J. Formation of chelee transitional to large type on both sides after amputation 

 of large (right) chela and section of nerve of remaining small chela. Originally a 

 right-handed female. Appendages as they appeared after the first moult, fourteen 

 days after operation. Two days before the moult the left chela showed a regain of 

 nervous control. 



