No. 6. - June, igoi. 



PAGES 



I. EDWIN G. CONKLIN. 



Tlic Individuality of tlie Germ Nuclei during 



the Cleavage of the Egg of Crepidula . . 257-265 



II. CHARLES ZELKNY. 



The Early Development of the Hypophysis 



in C lie Ionia 267281 



III. HARRY BEAL TORREY. 



On Phoronis Pacifica (Sp. A r ov.} .... 283-288 



IV. ELIZABETH W. TOWLE. 



On Muscle Regeneration in the Limbs of 



Plethedon "... 289-299 



V. T. H. MORGAN. 



The Factors that determine Regeneration in 



Antennularia 301-305 



VI. C. B. DAVENPORT. 



Mendel's Lazv of Dichotomy in Hybrids . . 307-310 



VII. T. H. MORGAN. 



Regeneration of Proportionate Structures in 



Stentor 311328 



ALSO: 



Abstracts of Papers presented at the Meetings of the 

 American Morphological Society at Baltimore, 

 December 27 and 28, I<JOO. Edited by the 

 Secretary of the Society 329-365 



