^ef. 



CONTENTS OF VOL. XI. 



[THIRD SERIES.] 



NUMBER LXI. 



Page 



I. Notes on the Hydroida. By Prof. Allman 1 



II. On the Raphides of British Plants. By George Gulliver, 

 F.R.S., Professor of Comparative Anatomy and Physiology to the 

 Royal College of Surgeons 13 



III. On the proposed Change in Name of Gracula pectoralis. By 

 Alfred R. Wallace 15 



IV. Descriptions of Five new Genera of Mollusca. By Henry 

 and Arthur Adams 18 



V. On new Species of Snakes in the Collection of the British Mu- 

 seum. By Albert Gunther, M.A., M.D., Ph.D. (Plate III.) 20 



VI. On new Species of Batrachians from Australia. By Albert 

 Gunther, M.A., M.D., Ph.D. (Plate IV.) 26 



VII. Descriptions of newly discovered Spiders captured in Rio 

 Janeiro by John Gray, Esq., and the Rev. Hamlet Clark. By John 

 Blackwall, F.L.S 29 



VIII. On some new British Hydroids. By the Rev. Thomas 

 Hincks, B.A 45 



IX. On the Transformations of the Porcellance. By Dr. Fritz 

 Muller, of Desterro. (Plate I.) 47 



New Books : — The Student's Manual of Geology, by J. Beete Jukes, 

 M.A., F.R.S.— The Coal-fields of Great Britain : their History, 

 Structure, and Resources ; with Notices of the Coal-fields of 

 other parts of the World, by Edward Hull, B.A 51 — 55 



Proceedings of the Zoological Society 55 — 71 



Use of the Weights and Measures of the Metric System in Scientific 



Pursuits; The Unicorn of the Ancients, by Dr. A. E.Brehm... 71* 72 



