E. II. J. SCHUSTPm 



TABLE VIII. 

 Carapace Length. ?. 



195 



The mean carapace length in the deep water forms is greater than that of the 

 shallow water forms by an amount about ten times as great as its probable error. 



Thus in both male and female the mean carapace length is greater in the deep 

 water forms, in the female by a certainly siguificant amount, in the male by a 

 qiiantity which taken alone could hardly be taken as significant, but viewed 

 in the light of the result obtained by the female it may possibly be considered 

 to be so. 



III. 



On the Comparative Variuhility of Deep und ShaUoiu Water Forms. 



TABLE VIII bis. 



25—2 



