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THE AMEBIC AN NATURALIST 



[Vol. XLII 



8. A female aerates her eggs both on land and in water. 



9. Crawfish come up into the shallows and elevate their 

 carapaces partly out of the water. 



10. Combing or cleaning movements are executed by 

 means of the first and second ambulatory appendages. 

 These consist in scraping the carapace. 



11. Males do not distinguish between the other males 

 and the females, and frequently grasp males and attempt 

 to copulate with them. 



1895. Andrews, E. A. Conjugation in an Anirriean Crayfish. Am. Nat., 

 Vol. 29, pp. 867-875. 



1900. Dearborn, G. N. Notes on the individual psycho-physiology of the 

 crayfish. Am. J. Physiol., Vol. 3, pp. 404-433. 



1895. Herrick, F. H. The American Lobster. Bull. V. S. Fish Com- 

 mission, 1895, pp. 1-252. 

 Ortmann, A. E. The Crawfishes of the State of Pennsylvania. 



