16 



Prof. W. F. R. Weldon. Certain 



[Mar. 3, 



Table XI. — Mean Length of Sixth. Abdominal Tergum for each 

 Value of Total Carapace Length. (Plymouth : 1000 individuals.) 



M c = 249-63; Q c = 4'55. M T vi = 145-71 ; Q Tvi = 2-82. 



Length of c. 



IVTean associated 

 length, of Tvi. 



Tvi when r = 0*09. 



Difference 

 observed., Tvi. 



257 



, 



146 *91 



146 ' 12 



+ 0-79 



256 



146 '46 



146 ' 06 



+ *40 



255 



145 "95 



146-00 



-0-05 



254 



145 -10 



145 -95 



-0-85 



253 



145-35 



145 -89 



-0-54 



252 



146 -76 



145 -84 



+ 0-92 



251 



145 -93 



145 -78 



+ 015 



250 



145 -70 



145-73 



-0-03 



249 



145 '47 



145 -68 



-0-21 



248 



146-02 



145 -62 



+ 0-40 



247 



145 -44 



145 -56 



-0V12 



246 



146 -30 



145 -51 



'. fljfr ' 



245 



145 '96 



145 -46 





244 



144-22 



145 -40 





243 



146 -17 



145 -34 



+ U-83 



242 



145 -68 



145 -29 



+ 0-39 



Table XII. — Value of Total Carapace Length for observed Lengths 

 of Sixth Abdominal Tergum. (Plymouth : 1000 individuals.) 



Length of Tvi. 



Mean associated 

 length of c. 



Length of c when 

 r = 0-09. 



Difference 

 observed, c. 



151 



250 -26 



250-40 



-0-14 



150 



250 -00 



250 -25 



-0-25 



149 



249 -79 



250-11 



-0-32 



148 



250 -42 



249-99 



+ 0-43 



147 



249 '46 



249 -81 



-0-35 



146 



249-19 



249-67 



+ 0-48 



145 



248 -08 



249 -53 



-1-45 



144 



249 -24 



249 -38 



-0-14 



143 



249-84 



249 -24 



+ 0-60 



142 



248-72 



249 -09 



-0-37 



141 



248 -55 



248-95 



-0-40 



140 



249 -06 



248-81 



+ 0-25 



