GENERAL DISCUSSION. 



TABLE 1. Constants of variation in the crayfish. 



CHARACTER. 



UNIT 



OP 



GROUP- 

 ING. 



MEAN. 



MODE. 



STANDARD 

 DEVIATION. 



COEFFICIENT 



OF 

 VARIATION. 



Cephalothorax. 



Head 



Meripodite: 



Leg i 



Leg ii 



Leg in 



Carpopodite: 



Leg i 



Leg ii 



Leg in 



Propodite: 



Leg i 



Leg ii 



Leg in 



mm. 

 1 



0.5 



0.5 

 0.4 

 0.4 



0.4 



0.2 

 0.3 



1 



0.3 

 0.4 



26.032 0.115 



10.554 .054 



10.074 .053 



7.847 .040 



8.819 .042 



7.368 .042 



4.800 .026 



6.139 .032 



20.738 .150 



7.060 .034 



9.090 .043 



24.743 

 10.318 



9.6G6 

 7.492 

 8.486 



7.037 

 4.562 

 5.873 



19.189 

 6.855 

 8.983 



2.865 0.081 



1.347 .038 



1.325 .038 



1.006 .029 



1.056 .030 



1.051 .030 



0.658 .019 



.809 .023 



3.743 .106 



0.853 .024 



1.072 .030 



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 .3i7 



11.789 .339 



CHARACTER. 



Cephalothorax. 



Head 



Meripodite: 



Leg i 



Leg ii 



Leg in 



Carpopodite: 



Leg i 



Leg ii 



Leg in .... 

 Propodite: 



Leg i 



Leg ii 



Leg in .... 



8.2092 

 7.2594 



7.0208 

 6.3258 

 6.9680 



6.9056 



10.8168 



7.2794 



14.0072 

 8.0844 

 7.1764 



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. 



KUETOSIS. 



SKEWNESS. 



MODAL DIVER- 

 GENCE. 



TABLE NUMBEK.I 



Cephalothorax. 



Head 



Meripodite: 



Leg i 



Leg ii 



Leg in .... 

 Carpopodite: 



Leg i 



Leg ii 



Leg in .... 

 Propodite: 



Leg i 



Leg ii 



Leg in .... 



0.2753 

 .5459 



.1158 

 .1696 

 .2830 



.2543 



.2954 



1.6565 



0.3697 

 .3150 

 .1797 



+0.4500 



+ .1748 



+ .3077 



+ .3530 



+ .3158 



+ 3144 



+ .3619 



+ .3293 



+ .4139 



+ .2406 



+ .0994 



1.289 0.141 



0.236 .066 



.408 .065 



.355 .049 



.333 .052 



.330 .052 



.238 .032 



.267 .040 



1.549 .184 



0.205 .042 



.107 .053 



.22 

 .22 



.22 

 .22 

 .22 



.22 

 .22 

 .22 



.22 

 .22 

 .22 



i 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. 



