[ iv ] 
XX. On the Classification of Loci. By W. K. Clifford, F.P.S., Professor of Applied 
Mathematics in University College, London page 663 
XXI. On the Osteology of Polyodon folium. By Thomas William Bridge, B.A., 
Scholar of Trinity College, and Demonstrator of Comparative Anatomy in the 
University of Cambridge. Communicated by Alfred Newton, M.A., F.R.S., 
Professor of Zoology and Comparative Anatomy in the University of Cam- 
bridge 683 
XXII. Contributions to the Anatomy of the Central Nervous System in Vertebrate 
Animals. By Alfred Sanders, M.P.C.S., F.L.S., late Lecturer on Compara- 
tive Anatomy at the London Hospital Medical College. Communicated by 
Professor Huxley, Sec. P.S. 735 
XXIII. On the Determination of the Constants of the Cup Anemometer by Experimen ts 
with a Whirling Machine. By T. R. Robinson, D.D., F.R.S., &c. . . 7 77 
Index 823 
