20 Prof. W. F. R. Weldon. Certain [Mar. 3, 



Table XIX. — Mean Length of Sixth Abdominal Tergum for observed 

 Lengths of Telson. (Plymouth : 1000 individuals.) 



M Tvi = 145-71 ; Q Tv i = 2-82. M Te = 193 08 ; Q Te = 4"55. 



Length of Te. 



jyiean associated. 



Tionfff h at T'tti 

 JLitJllci uil KJL _L V 1 



xj i ii t; 1 1? 11 u t? 



lengtn 01 jlvi. 



"wlicn v — "™"0*XX. 



observed, Tvi* 



200 



145 -69 



145 '23 



+ 0-46 



199 



144*40 



145 -30 



-0-90 



198 



144 -58 



145*37 



-0-79 



197 



143 54 



145-44 



-1-90 



196 



145 -87 



145 -51 



+ 0-36 



195 



145 -29 



145 -58 



-0-23 



194 



145 -48 



145 -85 



-0-17 



193 



144 -91 



145-72 



-0-81 



192 



145 '17 



145 -78 



-0-61 



191 



147-50 



145-85 



+ 1-65 



190 



147 24 



145 -93 



+ 1-31 



189 



145 -83 



146-00 



-0-17 



188 



142 -54 



146 -07 



-3-53 



187 



145 -53 



146-14 



-0-61 



Table XX. — Mean Length of Telson for observed Lengths of Sixth 

 Abdominal Tergum. (Plymouth : 1000 individuals.) 



Length of Tvi. 



Mean associated 



Te when 



Difference 



length of Te. 



r = -0 11. 



observed, Te. 



150 



193 -92 



193 70 



+ 0-22 



149 . 



191-60 



193 '56 



-1-96 



148 



193 -42 



193 -41 



+ 0-01 



147 



193 -22 



193 27 



-0-05 



146 



192-99 



193 -12 



-0-13 



145 



193 -94 



192-98 



+ 0-96 



144 



193 13 



192 -83 



+ 0-30 



143 



192-66 



192 -69 



-0-03 



142 



193-24 



192-55 



+ 0-69 



141 



193-24 



192 -40 



+ 0-84 



140 



191-02 



192-26 



-1-24 



