Contents of Volume LI II 



No. i. JULY, 1927. 



Twenty-ninth Animal Report of the Marine Biological Lab- 

 oratory i 



No. 2. AUGUST, 1927. 



CRABB, EDWARD DRANE. Anatomy and Function of the Rc- 

 productive System in the Snail, Lyiniuea stagnalis ap- 

 pressa Say 55 



CRABB, EDWARD DRANE. The Fertilization Process in the 



Snail, LymiKca st agnails apprcssa Say . . . . 67 



RATCLIFFE, H. L. Mitosis and Cell Division in Euglcna 



spirogyra Ehrcnbcrg 109 



COE, WESLEY R. The Nervous System of Pelagic Ncmcr- 



teans 123 



No. 3. SEPTEMBER, 1927. 



CASTLE, W. A. The Life History of Phtnaria vclata 139 



HEATH, HAROLD, AND WILBUR, BLAKE C. The Development 



of the Soldier Caste in the Termite Genus Ternwpsis. . . 145 



BEAMS, H. W. Maturation Phenomena in Artificial Parthe- 

 nogenesis of Asterias forbesii 155 



FRY, HENRY J. The Cross Fertilisation of Enucleated 



Echinarachniits Eggs by Arbacia Sperm 173 



BOWEN, ROBERT H. A Preliminar\ Report on the Struc- 

 tural Elements of the Cytoplasm in Plant Cells 179 



INMAN, O. L. A Pathogenic Luminescent Bacterium 197 



BRINLEY, F. J., AND BAKER, R. H. Some Factors Affecting 



the To.\'icit\ of Hydrocyanic Acid for Insects 201 



GRAVE, BENJAMIN H. The Natural History of Cnmingia tel- 



linoidcs 208 



iii 



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