﻿CONTENTS. 



On the General Theory op Duplex Telegraphy, — ly Louis 



schwendlee, ., 1 



Descriptions of New Marine Mollusca erom the Indian Ocean, 



— (with PL I.), — hy Messrs. G. and H. Nevill, 21 



Remarks on some Indian Fishes, hy Surgeon-Major Francis 



Day, 31 



