122 



PROBLEMS OF RELATIVE GROWTH 



in the appendages just posterior to the special growth-centre, 

 there is a slight decrease of relative size in those immediately 

 anterior to it. 



•5? 

 o 



° Aft- 



•2? 



3rd- 

 Maxilliped 



(aid) 



2nd. 3rd. 



4th. 



5th. 



- 60 



-50 



- 40 



30 



20 



Chela 



Pereiopod 



3rd. Chela 2nd. 

 mxpd propus s * 

 (xlO) (X6) 



B 



Zrd. 

 Pereiopcds 



Fig. 65. — Graph of changes in relative size of parts associated with a local 



region of high growth-intensity (male chela) in spider-crabs, (A) Maia 



squinado, (B) Inachus dorsettensis. 



