I9I4-J 



S. Kemp : Noies on Crustacea Decapoda. 



attain a monstrous size, while in others they are small and 

 approximate more or less closely to those of the female. But this 

 alone is, in^my opinion, insufficient to prove the existence of 

 dimorphism: it is essential that the specimens should fall into 

 two well-defined groups and that their measurements, when 

 plotted, should yield a bimodal curve. Measurements of our 

 specimens show no indication of this. The greatest proportional 

 size of the limbs is found in large specimens, but the figures, when 

 plotted, give little other information of interest ; there is no trace 

 of a bimodal curve and even on casual examination of the speci- 

 mens, it is evident that for all practical purposes the series is a 

 graded one. 



Measurements of mai,e Saron marmoratus. 



Local it V. 



Kaiachi 



Andamans .. 

 Port Canninor 



In the measurements taken my specimens seem to agree with 

 those examined by Coutiere who has nowhere stated that they can 

 be sharply divided into two groups. They are, however, directly 



