SECONDARY SEXUAL CHARACTERS OF CRAYFISHES. 2J3 



To say that the irregularities in the secondary sexual charac- 

 ters may be transmitted is not to answer the question of their 

 origin. It would imply, however, that the cause producing 

 the effect was deeply seated in the germ cells and was not brought 

 about by a temporary, somatic influence. 



LITERATURE LIST. 

 Faxon, Walter. 



'81 Bull. Mus. Comp. ZoOl., Vol. VIII.. No. 13. 

 Faxon, Walter. 



"85 M.-moirs Mus. of Comp. Zool.. Harvard College, Vol. X.. pp. 12-14. 

 Faxon, Walter. 



'98 Pro .U.S. Nat. MOB., XX.. p. 683. 

 Hay, Win. P. 



'05 ^;mih-..M.m M ;- -Ilancou- :ons. Vol. III., Part r, pp. jjj-j28. 



Lbnnberg. 



'98 / p. 334-335 and 345- 



Nicholls, F. 



'30 1' he Royal Society 01 '.XXXVI.. 



. 

 Ortmann, A. E. 



'05 \I' . Vol. II.. No. 10. pp. 37 iSS. 



Rosseau and Desmarest. 



'48 Amui!' .juc de France, : VI., pp. 479 



aii'l .jM . 

 Smith, Geoffrey. 



'10 <jii.irt. .! ''MM. ' ;.j. No. 216. pp. 577-603. 



Smith, Geoffrey. 



"10 nii.ut. Jiiurn. M . 218. pp. 225-.'.} i. 



Von Ihring. 



'9- i Mosi 



Von Martens. 



'70 Sii/unn>l'i.-riL-li: Gesellschaft N i lni. 



