BIOLOGICAL BULLETIN 



fiDarine Biological Xaborator^ 



WOODS HOLE, MASS. 



Vol. XVIII 



Holmes, S. J., and 

 homuth, e. s. 

 Child, C. M. 



Payne, Fernandus. 

 Wjeman, H. L. 

 Payne, Fernandus. 

 Mast, S. O. 

 Cole, Leon J. 



Smith, Bertram G. 



March, 1910 



No. 4 



CONTENTS 



Page 



The Seat of Smell in I he Crayfish 155 



Aizalysis of Form Regulation ivit/i the Aid 



of Ancesthetics 161 



The Chromoso7nes of Acholla niultispinosa i 74 



The Pole Disc of Chrysomelid Eggs iSo 



T'orty-nine Generations in the Dark 188 



Do Blow Fly Larvce Respond to Gravity? 191 

 Pectiliar Habitat of a Pycnogonid 

 ( Endeis spinosus ) new to North 

 America^ with Observations on the 



Heart and Circzilation 1 93 



The Structure of the Sperniatophores of 

 Ambystoma punctatum 204 



Published Monthly by the 

 MARINE BIOLOGICAL LABORATORY 



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THE NEW ERA PRINTING COMPANY 

 LANCASTER, PA. 

 Agent for Great Britain. Agent for Germany 



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R. FRIEDLANDER 



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Berlin, N. IV. 

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Single Numbers, 75 Cents. Per Volume (6 numbers), S3. 00 



Entered October 10, 1902, at Lancaster, Pa., as second-class matter, 

 under Act of Congress of July 16, 1894. 





