82 



PROBLEMS OF RELATIVE GROWTH 



above general form as giving a close approximation to the truth, 

 and therefore in using the values of the growth-coefficients 

 (k) as obtained from this type of expression as standards of 

 growth-intensity. 



UCA PUGNAX c? . 



Region 



TABLE VI 



Mean Weights (mg.) of Three Regions of Large 

 Chela (57 Specimens) 



Distal (dactylus + propus) 

 Intermediate (carpus) 

 Proximal (merus + ischium 



to breaking- joint) 



515 

 70-8 



103 



TABLE VII 



Growth-coefficients of Different Regions of the Large Male 

 Chelae in Different Crustacea (based on Huxley, 1927 and 

 unpublished, and dean, unpublished, analysis of kemp) 



Units of Measurement. 



Species 



Weight, relative to total : Uca pug- 

 chela weight (distal ! nax 

 to breaking-joint) 



Maia 

 squinado 



Weight, relative to 

 body-weight 



Length, relative to total Palaemon 



cheliped length (dis 

 tal to breaking-joint) 



rudis 



1-19 



2-22 2*IO 



Investigations are now in progress which have for their aim 

 the clearing up of some of the practical and theoretical diffi- 

 culties in the way of obtaining a quantitatively accurate 

 picture of the growth-gradient within an organ. Until these 

 have been completed, I shall here content myself with estab- 

 lishing the fact that a gradient of some sort exists ; and 

 in the graphic representation of growth-gradients I shall 



