CONTENTS OF No. 137. -New Series. 



MEMOIRS: 



On the Morphology and Physiology of the Brain and Sense Organs 

 of Limulus. By William Patten, Ph.D., University of North 

 Dakota, Grand Forks, U.S.A. (With Plates 1, 2, 3, 4 and 5) 



The Structure of the Pharyngeal Bars of Amphioxus. By W 

 Blaxland Benham, D.Sc.Lond., Hon. M.A.Oxon., Aldrichian De 

 monstrator of Comparative Anatomy in the University of Oxford 

 (With Plates 6 and 7) .97 



On the Perivisceral Cavity of Ciona. By A. H. L. Newstead, B.A., 

 late Scholar of Christ's College, Cambridge. (With Plate 8) . 119 



The Early Stages in the Development of Distichopora violacea, 

 with a Short Essay on the Fragmentation of the Nucleus. By 

 Sydney J. Hickson, M.A. Cantab, et Oxon., D.Sc.Lond., Uni- 

 versity Lecturer on the Morphology of Invertebrates ; Fellow of 

 Downing College, Cambridge. (With Plate 9) . . .129 



