360 Charles Zeleny. 



the lesser injury (Series A), or 41 per cent, had moulted while at 

 the same time all those of Series B had moulted. Likewise 95 

 days after the operation only one out of the nineteen female mem- 

 bers of Series A or 5.3 per cent had moulted while thirteen out of 

 the 25 living members of Series B, or 52.0 per cent, had done so. 

 At the same time the only individuals that had moulted a second 

 time belonged to the series with the greater injury. Of these one 

 is a male and the other four are females. 



One hundred and thirty days after the operation Series B shows 

 a similar advantage over Series A. Only five out ot the nineteen 

 females, or 26.3 per cent, of Series A had moulted once or more 

 as against nineteen out of twenty-five, or 76.0 per cent, of the living 

 females of Series B. At the same time only 6.7 per cent of the 

 males and 5.3 per cent of the females of Series A had moulted 

 twice while 53.8 per cent of the males and 50.0 per cent of the 

 females of Series B had done so. The one individual that had 

 moulted a third time belongs to the series with the greater injury 

 in accordance with the general rule for the other moults. 



The final data as collected 181 days after the operation, when the 

 experiment was closed, show the same advantage of Series B over 

 Series A. Thus only 42.9 per cent of the living males and 16.7 

 per cent of the living females have moulted twice while 76.9 per 

 cent of the living males and 87.5 per cent of the living females of 

 Series B have done so. For the third moult at the same time 

 there are none of the males and only one female, or 5.6 per cent 

 of the living females, in Series A as against one male, or 9.1 per 

 cent of the living males, and three females, or 15.0 per cent of 

 those living, in series B. 



The general result is very clear. The individuals of Series B 

 moult more rapidly than those of Series A. Emphasis must be 

 again laid on the fact that Series B differs from Series A only in 

 the greater degree of injury in the former. All other conditions 

 are as nearly alike as possible in the two cases. 



Specific /Amount of Rege?ieratioj2. 



The amount of regeneration of the right chela at the end of the 

 first moult divided by the thoracic length gives a quotient which 

 mav be called the specific amount of regeneration or the amount 

 per unit of thoracic length. It is a fairly constant quantity for the 



