2O6 ED.Ml.-M) IJ. WILSON. 



latory or other non-nervous disturbance. Since, however, the 

 appendage remains in a healthy state and emerges from the 

 moult in a quite normal condition and without sign of atrophy, 

 it seems more probable that the effect is directly due to the lack 

 of nervous control. 



The two exceptions recorded above are of considerable inter- 

 est. In the first case the animal, originally a right-handed 

 female, shows a perfectly typical reversed condition. In the 

 second, the animal, originally a right-handed female, has regen- 

 erated both chelae of the large type, showing the characteristic 

 hammer and other distinctive characters (Fig. 3, /, /). The left 

 chela (originally the small one) is, however, distinctly less modi- 

 fied than the right, being more slender, with longer and more 

 slender claws, and is in this and other respects clearly intermed- 

 iate in character between chelae of the large and small type 

 (Fig. 3, /). Both these specimens, and these alune of tJiose re- 

 corded, had regained partial control of t/ie remaining appendage 

 before the moult. Unfortunately the record does not show pre- 

 cisely how long the control had been regained before the moult. 

 The facts indicate, however, that in the first case the nervous 

 connections had been reestablished relatively early, so that the 

 typical metamorphosis took place. This case probably gives an 

 interpretation of the second one, which may be explained by sup- 

 posing that in the early period, before the nervous connections 

 were established, the stump of the large chela (right) had already 

 partially regenerated a chela of the same type (as in the typical 

 case); but that the transformation did not proceed so far as 

 wholly to check the metamorphosis of the small chela (left) upon 

 the reestablishment of control. Both claws, therefore, reap- 

 peared of the large type, that on the right, however, being more 

 modified than the other. 



REVERSAL IN RELATION TO THE SECONDARY SEXUAL 



CHARACTERS. 



The experiments bring out some interesting points in relation 

 to the secondary sexual characters (which were not studied by 

 Przibram) and offered data of some importance for the gen- 

 eral interpretation of the facts. These concern especially the 



