IV CONTENTS OF VOLUME XXVI. 



No. 5. MAY, 1914. 



SMITH, BERTH, G. An Experimental Study of Concrescence in 



the Embryo if Cryptobranchus alleghcnicnsis 245 



ANDREWS, E. A. The Bottle- Animalcule, FolUculina; Geological 



Notes 262 



CHILD, C. M. y sexual Breeding and Prevention of Senescence in 



Planaria veil, 'a 286 



SHELFORD, VICTOR E. An Experimental Study of the Behavior 



Agreement Among the Animals of an Animal Community . . . 294 



No. 6. JUNE, 1914. 



The Marine Biological Laboratory. Sixteenth Report 317 



BACHMANN, FREDA M. The Migration of the Germ Cells in 



Amiurns nebnhsus 351 



GLASER, OTTO. A Qualitative Analysis of the Egg-Secretions 



and Extracts of Arbacia and Asterias 367 



GLASER, OTTO. On Auto-parthenogenesis in Arbacia and Asterias 387 



