CONTENTS OF No. 231.-New Series. 
MEMOIRS : 
Stolon Formation in Certain Species of Trypanosyllis. By F. A. 
Potts, M.A., Fellow of Trinity Hall, Cambridge, and Demonstrator 
of Comparative Anatomy in the University. (With Plates 23 and 
23 bis and 8 Text figures) . . . . . 
The Effects of Hypertonic Solutions upon the Fertilised Eggs of 
Echinus (E. esculentus and E. acutus). By J. Gray, B.A., 
Scholar of King’s College, Cambridge. (From the Laboratory 
of the Marine Biological Association, Plymouth.) (With Plates 
24 to 27 and 4 Text-figures) ..... 
Cytological Observations on the Early Stages of Segmentation of 
Echinus Hybrids. By L. Doncaster, M.A., Fellow of King’s 
College ; and J. Gray, B.A., Scholar of King’s College, Cambridge. 
(With Plates 28 and 29) . 
The Life-Cycle of Moina rectirostris. By the late G. H. 
Grosvenor, M.A., New College, Oxford, and Geoffrey Smith, 
M.A., New College, Oxford ..... 
On Methods of Producing Artificial Parthenogenesis in Echinus 
esculentus and the Bearing of the Parthenogenetic plutei 
through Metamorphosis. By Crbsswell Shearer, University 
Lecturer in Experimental Morphology, Cambridge, and Dorothy 
Jordan Lloyd, Bathurst Student, Newnham College, Cambridge. 
(With Plates 30 to 32) . . . . . 
Changes in Chondriosomes Occurring in Pathological Conditions. By 
J. O. W akelin Barratt. (From the Cancer Research Laboratory, 
University of Liverpool.) (With 11 Text-figures) 
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