viii Contents. 



PART III. APRIL, 1895. 



PAGE. 



XII. A NEW PART OF PACHYTHECA. By The Editor . . . .71 



XIII. CALCAREOUS PEBBLES FORMED BY ALG/E. By The Editor. With 



LIST OF DIATOMS. By E. Grove ...... 74 



XIV. NOTES ON THE SORI OF MACROCYSTIS AND POSTELSIA. By A. L. 



Smith and F. G. Whitting 83 



XV. A COMPARISON OF THE ARCTIC AND ANTARCTIC MARINE FLORAS. 



By The Editor and E. S. Barton 87 



