1892.] Correlated Variations in Crangon vulgaris. 



13 



Table V. — Mean Length of Post-spinous Portion for every observed 

 Value of Total Carapace Length in Roscoff. (500 individuals). 



M c = 251 ' 51 ; Q c = 3 -32. M ps =* 178 -00 ; Q ps = 3 '02. 



Length, of 

 c. 



Mean associated 

 length of ps. 



Length of ps -when 

 r = -80. 



Difference 

 observed, ps. 



over 257 



184 -54 



184 -75 



-0-21 



257 



181 -70 



181 -99 



-0-29 



256 



181 -67 



181 -27 



+ 0-40 



255 



180 -88 



180-54 



+ 0-34 



254 



179 -89 



179-81 



+ 0-08 



253 



178 -50 



179 -18 



-0-32 



252 



177 -89 



178 -36 



-0-47 



251 



178 -02 



177 -64 



+ 0-38 



250 



177 -52 



176 -91 



+ 0-61 



249 



176 -75 



176 -45 



+ 0*30 



248 



176-52 



175 -46 



+ 1-06 



247 



174-68 



174 71 



-0-03 



246 



173 -54 



173 -98 



-0-44 



under 246 



170 -06 



169 -94 



+ 0-08 



Table VI. — Mean Value of Total Carapace Length for every observed 

 Value of Post-spinous Portion. (Roscoff : 500 individuals.) 



Length of ps. 



Mean associated 

 length, c. 



Length of c when 

 r = -80. 



Difference 

 observed, c. 



Over 184 



260 -34 



260 '98 



-0-64 



184 



257 '45 



256 -80 



+ 0-65 



183 



256-28 



255 -70 



+ 0-58 



182 



254 -57 



255 -02 



-0-45 



181 



254-69 



254-14 



+ 0-45 



180 



253-69 



253 -26 



+ 0-43 



179 



252-29 



252 -39 



-o-io 



178 



251-09 



251-51 



-0-42 



177 



250 -02 



250 -63 



-0-61 



176 



250-07 



249 -76 



+ 0-31 



175 



248 -82 



248 -88 



-0*06 



174 



246 '92 



248-00 



-1-08 



173 



245 -94 



247-11 



-1-17 



Under 173 



240-76 



242-33 



-1*57 



