GENERAL DISCUSSION. 



Table 1. — Constants of variation in the crayfish. 



Chaeactee. 



Cephalothorax, 



Head 



Meripodite: 



Leg I 



Leg II 



Leg III 



Carpopodite: 



Leg I 



Leg II 



Leg III 



Propodite: 



Leg I 



Leg II 



Leg III 



Unit 



OF 



Gkoup- 



ING. 



1 



0.5 



0.5 

 0.4 

 0.4 



0.4 

 0.2 

 0.3 



1 



0.3 



0.4 



Coefficient 



OF 



Variation. 



11.006 ±0.316 



12.769 ± .368 



13.151 ± .379 



12.821 ± .369 



11.972 ± .344 



14.267 ± .413 



13.705 ± .396 



13.184 ± .380 



18.047 ± .528 



12.082 ± .347 



11.789 ± .339 



Charactee. 



Cephalothorax 



Head 



Meripodite: 



Leg I 



Leg II 



Leg III 



Carpopodite: 



Leg I 



Leg II 



Leg III 



Propodite: 



Leg I 



Leg II 



Leg III . . . , 



8.2092 

 7.2594 



7.0208 

 6.3258 

 6.9680 



6.9056 



10.8168 



7.2794 



14.0072 

 8.0844 

 7.1764 



'^3 



14.1666 

 8.0563 



9.4291 



8.9834 



10.2582 



9.9654 

 21.5662 

 16.7523 



35.1225 



10.9026 



9.0192 



220.7255 

 186.8628 



153.5801 

 126.8318 

 159.39995 



155.1885 

 385.5747 

 246.7453 



661.1373 

 216.6607 

 163.7572 



0.3628 

 .1697 



.2569 

 .3188 

 .3110 



.3016 

 .3675 

 .7276 



.4489 

 .2250 

 .2201 



3.2753 

 3.5459 



3.1158 

 3.1696 

 3.2830 



3.2543 



3.2954 

 4.6565 



3.3697 

 3.3150 

 3.1797 



Character. 



Kttrtosis. 

 (^2-3) 



Cephalothorax 



Head 



Meripodite: 



Leg I 



Leg II 



Leg III 



Carpopodite: 



Leg I 



Leg II 



Leg III 



Propodite: 



Leg I 



Leg II 



Leg III 



0.2753 

 .5459 



.1158 

 .1696 

 .2830 



.2543 



.2954 



1.6565 



0.3697 

 .3150 

 .1797 



Skewness. 



-f 0.4500 



-f .1748 



+ .3077 



+ .3530 



+ .3158 



+ .3144 



+ .3619 



+ .3293 



+ .4139 



+- .2406 



+ .0994 



Modal Diver- 

 gence. 



1.289 ± 0.141 



0.236 ± .066 



.408 ± .065 



.355 ± .049 



.333 ± .052 



.a30 ± .052 



.238 ± .032 



.267 ± .040 



1.549 ± .184 



0.205 ± .042 



.107 ± .053 



Table Number. i 



22 

 22 



22 

 22 

 22 



22 



22 

 22 



22 

 22 



22 



1 In this column are given the numbers of the correlation tables where will be found the dis- 

 tributions from which the constants of table 1 are deduced. 



