BIOLOGICAL BULLETIN 



flDarine Biological %aboraton> 



WOODS HOLL, MASS. 



Vol. XIII 



November, 1907 



No. 6 



CONTENTS 



Page 



D. D. Whitney. Artificial Removal of the Green 



Bodies of Hydra Viridis 291 



N. Yatsu. A Note on the Adaptive Sig- 

 nificance of the Sperm-head 

 in Cerebratulus 300 



Thomas H. Montgomery, Jr. On Parthenogenesis in Spiders 302 



S. J. Holmes. Rhythmical Activity in Infu- 

 soria 306 



D. H. Tennent. _ Further Studies on the Par- 



thenogenetic Development of 

 the Starfish Egg 309 



Fernandus Payne. The Reactions of the Blind Pish, 



Amblybpsis spelaeus, to Light 317 



S. W. Williston. The Antennce of Diptera ; A 



Study in Phytogeny 324 



C. H. Turner. Do Ants Form Practical Judge- 

 ments? 333 



Julian Mast Wolfsohn. The Causation of Maturation 



in the Eggs of Limpets by 

 Chemical Means 345 



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

 under Act of Congress of July 16, 1894. 



