VAKIATION IN 



"EUPAGURUS 

 (HELLEK). 



PRIDE AUXI" 



By E. H. 



SCHUSTER, B.A. 



I. 



Introduction. The work on which thc tollowing paper was bascd was donc in 

 the wintcr of lüOl — 1902 iliuiiig my occupancy of the Oxford Univcrsity table at 

 thc Naplcs Biological Station ; and I takc this opportunity of exprcssing my 

 appreciation of the kindness and courtesy of tliose members of the .stafl" of that 

 institution with whom I canic into contact. 



The subsequcnt calculations werc done iindi-r the dircction of Professor Weldon, 

 and I herewith tender hini my sincerc thanks for devoting so miuh timc and 

 trouble to the purpose. I have also to thank Professor Pearson für bis uumerous 

 and valuable suggestions. 



Thc work itself is an attempt to determine whether members of thc species 

 Ewpagurus pndeauxi caught in shallow watcr, differ with regai-d to certain charac- 

 ters from those caught in comparatively dcep water. 



For this purpose the following three measureinents were taken : 



1. From the upper articulation of the propodite with the carpopodite of the 



right chehi to the upper and outer articulation of thc propodite with the dactylo- 



podite, called Measurement No. 1. Fig. 1, AB. 



-C 



A-- 



Fio. 1. 



