"K ASVMMETKY IN EA. 249 



moM powt-r n, produce a great chela of typical size ami form, 

 'lie t<-ii<li-n. . produce a chela of tin- ;>;rcat -i/e an<l t\pe 



tn.m ilu- uninjured first chela, even though this In.- tin- original 

 -mall . lu-l.i and i- located on the body side which has >uft< 

 the I" "t -til -.ihcr walking appendages. There seem- to \>c no 

 e\idt -in In -in the-e experiments to suggest a bilateral distribu- 

 ii"ji .,i ^n.uth energy accompanying distribution of appendage 

 material. 



SKCUXD SKRIKS. 



Tin- '|nr-tiun of a bilateral distribution of i;ro\\th rmn:\ re- 

 lated to, r accompanying, the amount of appendage man-rial 

 "ii n side was furtlu-r tested in the follu\\ini; nianiui. 



I specimens were operated upon so as to remove both chelae 



I ill. tii^t pair. It was known that when only tin - i\\<. ( IK la 

 moved that they regenerated in tln-ir original cniidiiii.ii. 

 a lai<r chela from the base of the original large cln-la and ,t 

 -mall i licla from the opposite side. If now in addition to du- 

 I of the first pair of appendages a number of mon pos- 

 terior appnidav;es also be removed from tin- large chela -idr. 

 HiU sidi- will have less appendage material remaining and i-. 

 therefore, called upon to regenerate a greater amount of man-rial 

 to n place the posterior legs. Will this side of the body at tin 

 -aim- time br more capable of producing a first chela of larger 

 and -prfi.ilixed type than the opposite side which is calli-d 

 upon in it-place only the first chela? Such an operation is illus- 

 iratrd |.\ I j-. i, /{, and Fig. I, D, forms a control experiment in 

 \\hirh tin- additional appendages are removed from the small 



chela -ide. 



Hie iiMial idea of regulation would require the side with only 

 ilie in -i N - removed to regenerate a large chela while the other 

 ^ide n plat i d tl ral posterior legs and produced a small 



lir-i chela. It i- found on examining the table that alter an 

 operation to remo\e l>oth first chelae and one or more posterior 



on 1-itln-r tli' it or small chela sidr that M'\ of (if; 



specimens regenerated the chela- of tin- lii>i pair etjual in >i/e. 



noi out- individual re\er-etl the t>|>e of the hr-t clu-la-. and 

 eiijit re-i-m-raied the lir-i ehela- iii their original condiiion a> 

 thou-h no .11 Mi i ion a I appendage- had In t n reino\ ed. < >ne speci- 

 men died liffoic the experiment \\a- completed. 



