REVERSAL <)T ASVMMETKV IN CRUSTACEA. 255 



CONCLUSIONS. 



Tin- power in reverse the asymmetry of the tir-t chela- when 



in-rating .1 ure.it claw in Alphens dor- not -eem t<> l>c clo-dy 



a--ot i.itrd with .1 difference in the amount of material on the 



tuo -ide- of the liorly nor with a bilateral di-trihution of growth 



or regenerative < n 



Although in certain cases there seems to lie a tendency to 

 aerate tin- clu-hi' of the first pair equal in -i/e and >imilar 

 in i\|ie. -mh a tendency is manifest under condition- -o \aried 

 in re-pi-d io the bilateral clistriltution of ajipi'iida^e material 

 and < all upon the powers of regenerative eneiu\ that the pre-cnt 

 com Ill-ion j- warranted. The amount of material on a ;J\n 

 -ide of the animal, or the amount of t< ^ -m -ration requited of 

 ihi- -id- .in- negative factors in determining tin- al>ilit\ of the 

 -ide to pid<ltK e a great chela instead of a HIM 1 1 one. 



N \i'i i .-. July 5. 1910. 



