iv CONTENTS. 



Page 

 On the Occurrence of Eolis Landsburgii, by the Rev. T. Hincks, 

 B.A. ; Discovery of the Remains of several Orders of Reptiles in 

 the Old Red Sandstone and Shales of Scotland; Notes on the 

 Habits of the Crustacea of the Antilles, by Dr. P. Duchassaing of 

 Panama ; Obituary — Mr. Samuel Veall ; Meteorological Observa- 

 tions and Table 73—80 



NUMBER L. 



VII. On the Cassidulida of the OoHtes, with descriptions of some 

 new species of that family. By Thomas Wright, M.D. &c. (With 

 two Plates.) 81 



VIII. Upon the Production of Mollusks in Holothurice. By Prof. 

 MiJLLER 103 



IX. Brief Diagnostic Notices of new Maderan Land Shells. By 

 R.T. Lowe, M.A 112 



X. On the probable Dimensions of Carcharodon Megalodon from 



the Crag. By J. S. Bowerbank, F.R.S., L.S. &c 120 



XL Descriptions of Ruhi. By Charles C. Babington, M.A., 

 F.R.S. &c 123 



XII. Observations on the Affinities of the Olacacece. By John 

 MiERs,Esq., F.R.S., F.L.S 128 



New Books : — Narrative of the Voyage «f H.M.S. Rattlesnake, during 

 the years 1846-50, by John MacGiUivray, F.R.G.S., Naturahstto 

 the Expedition. — The Geology and Fossils of the Tertiary and 

 Cretaceous Formations of Sussex, by Frederick Dixon, F.G.S. — 

 A Popular History of British Ferns and the allied Plants, by T. 

 Moore, F.L.S. &c 132—141 



Proceedings of the Zoological Society; Botanical Society of Edin- 

 burgh 142—152 



Observations on the genus Acosteea of D'Orbigny, by J. E. Gray, 

 F.R.S., V.P.Z.S. &c. ; Notice of the Sea Bream, Pagellus centro- 

 dontus, Cuv., taken in the Firth of Forth, by John Alexander 

 Smith, M.D. ; On the Circulation and Respiration of the Anne- 

 lida, by M. A. de Quatrefages ; On the Organ of Smell in the 

 Fluviatile and Terrestrial Gasteropodous Mollusca, by M. Moquin- 

 Tandon ; Monstrosity in the Petals of Honkeneja peploides, by 

 Charles C. Babington, M.A. ; On Anas glacialis, by William 

 Thompson ; Mollusca dredged in Cork Harbour during the Sum- 

 mer of 1851, by Samuel Wright and J. Carroll; On the General 



