CONTENTS OF VOLUME L. Ill 



ft 



SAMPSON, MYRA M. The Parthenogenetic Effect of Sperm 



Filtrates, Concentrated Sperm Suspensions, and Serum 



of Chitons on the Ova of Ike Sea- Urchin, Strongylocentrotus 



franciscanus 202 



CONNOLLY, C. J. Vasodilatation in Fundulus Due to a 



Color Stimulus 207 



MURRAY, MARGARET R. Secretion in the Amitotic Cells of 



the Cricket Egg Follicle 210 



BECKER, ELERY R. Vital Staining and Reduction of Vital 



Stains by Protozoa 235 



HEGNER, R. W. The Interrelations of Protozoa and the 



Utricles of Utricularia 239 



HEGNER, R. W. The Protozoa of the Pitcher Plant, Sarra- 



cenia purpurea 271 



No. 4. APRIL, 1926. 



FASTEN, NATHAN. Spermatogenesis of the Black-Clawed 



Crab, Lophopano pens bellus (Stimpson) Rathbun 277 



MONTGOMERY, ROBERT B. Sole Patterns of Twins 293 



SAMPSON, MYRA MELISSA. Sperm Filtrates and Dialyzates . 301 

 KOPEC, STEFAN. Is the Insect Metamorphosis Influenced by 



Thyroid Feeding? 339 



BELLING, JOHN. Single and Double Rings at the Reduction 



Division in Uvularia 355 



No. 5. MAY, 1926. 



OKADA, Y6 K. On the Photogenic Organ of the Knight-fish 



(Monocentris japonicus (Ilouttuyn)} 365 



BLACHER, L. J . The Dependence of Secondary Sex-Characters 



upon Testicular Hormones in Lebistes reticulatus 374 



BECKER, ELERY R. The Role of the Nucleus in the Cell 



Functions of Amcebx 382 



WILDER, HARRIS H. Palm and Sole Studies, IX 393 



HYMAN, L. H. The Axial Gradients in Hydrozoa, VIII. . . . 406 

 PETRUNKEVITCH, ALEXANDER. The Value of Instinct as a 



Taxonomic Character in Spiders 427 



