CONTENTS OF VOLUME XXX. 



No. i. JANUARY, 1916. 



PAGE. 



WODSEDALEK, J. E. Causes of Sterility in the Mule . ... I 

 KANDA, SAKYO. Studies on the Geotropism of the Marine Snail, 



Littorina littorea 57 



KANDA, SAKYO. The Geotropism of Freshwater Snails 85 



Xo. 2. FEBRUARY, 1916. 



LEWIS, MARGARET R., AND ROBERTSON, \\'M. REES B. The 

 Mitochondria and Other Structures Observed by the Tissue Cul- 

 ture Method in the Male Germ Cells of Chorthippus curtipennis 



Scudd 99 



ROBBINS, W. J. Notes on the Physiology of Fucus spermatozoids . 125 

 MOORE, A. R., AND KELLOGG, F. M. Note on the Galvanotropic 



Response of the Earthworm 131 



WILDER, HARRIS H. Palm and Sole Studies. I to IV 135 



NEWMAN, H. H. Heredity and Organic Symmetry in Armadillo 



Quadruplets 173 



No. 3. MARCH, 1916. 

 WILDER, HARRIS H. Palm and Sole Studies. \ and VI .... 211 



No. 4. APRIL, 1916. 



WILLIS, H. S. The Influence of the Nucleus on the Behavior of 



Amceba 253 



SUMNER, F. B. Notes on Superfetation and Deferred Fertilization 



Among Mice 271 



GOODALE, H. D. Further Developments in Ovariotomized Fowl . . 286 



BACHHUBER, L. J. The Behavior of the Accessory Chromosomes 

 and of the Chromatoid Body in the Spermatogenesis of the 



Rabbit 294 



iii 



