VOL. XI, NO. 473 



MAY, 1906 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOUENAL 

 DEVOTED TO THE NATUEAL SCIENCES 

 m THEIR WIDEST SENSE 



CONTENTS 



tion Theory to the Mollusca F. C. BAKEK : 



Egg-laying of Crayfish BE. E. A. ANDKEWS 84S 



Sowerby's Whale on the American Coast .... DB. G. M. ALLEN 357 



Fresh-water Ehizopods of Uantncket J. A. CUSHMAN 371 



Rotes and Literature : Zoology. Weismann's Theory of Descent, Brooks's; 

 The Oyster, Mayer's Sea-shore Life, Alder and Hancock's British Tuni- 

 cata, SchiUings's With Flash-light and Rifle, Notes, Recent Extension 

 of the Range of the Green Crab (O. Bryant), Ichthyological Notes . I7« 



BOSTON, U. S. A. 

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