vl CONTENTS. 
Mr. E. Hatu’s Notice of the Toadstones of Derbyshire ssseccreesssersneenseesunes 
Mr. Epwarp CuarLEsworrs on the Fossil Bodies regarded by M. Agassiz as 
the Teeth of a Fish, and upon which he has founded his supposed Gs 
Sphenonchus sevsssesereeseesserseeseeceeceeecseceecaenseennees as havemadearacnnee ae 
Mr. Turner’s Notice of Fossil Fish from Antigua ....cescccssesesseeaees sesh «Sate 
Mr. Francis WuisHaw on amethod of exhibiting, at one view, the results of a 
given Geological Survey sssssssssesssesececcecanaesseroeseuanes Ostincandg i dadcl-Anresic 
Mr. J. W. Satter’s Remarks on the Structure and Relations of Cornulites, and 
other allied Silurian Fossils ........... cssescssseeees DAS A RRS oe eee tao 
’s Notice of some important Additions to the Fossils of the 
Gilnrian WVOCKS* aevecieeesdeccseacancsace Saab alee Rech Dok cae Ri IU See was 
Mr. H. E. Srrickuanp on the results of recent Researches into the Fossil In- 
sects of the Secondary Formations of Britain .........ccsssecscseeseveeeeeeeeees weve 
Professor E. Forsss and Lieut. Spratt on a remarkable Phenomenon pre- 
sented by the Fossils in the Freshwater Tertiary of the Island of Cos......... 
Baron von WALTERSHAUSEN’S Abstract of a Paper on the Physico-Geographi- 
cal Description of Mount Etna. ...........ssscsscssecsscersersesnscensconsseseenseennses 
Mr. Epwarp CHARLESWoRTH on the Occurrence of the Mosasaurus in the 
Essex Chalk, and on the Discovery of Flint within the Pulp-cavities of its 
FRB REELED come a sideasnaaa hanes aduawasacbalcacu te sed clon cis ois catseteplabtaneee seleOh sia saiaceianiae eee 
Mr. Carter’s Notice of the Jaws of an Ichthyosaurus from the Chalk in the 
neighbourhood of Cambridge  ....sssesssssscrsessceereseecnnneeeteecerseaneeeteeenens 
Rey. J. G. Cummine on Posidonian Schist amidst Trappzan Beds, and on 
Traces of Drift-ice in the South of the Isle Of Man .....sssssceecneeeeeenee Sebiae s 
ZOOLOGY AND BOTANY. 
Mr. Wriitam Oerxsy on the Scientific Principles on which Classification in 
the higher Departments of Zoology should be based ........ssssssssseeeeereeeeees 
Dr. Fauconer on the Fossil Elephantine Animals of India ...........+.ssessseeee 
M. Srexys pr Lonecuamps on the Genus 4rvicola; on the Libellulide of Eu. 
rope ; on Hybrids of the Genus Anser ..........csssesecsseeereeseeeeenetceseeeeeeeee 
Dr. Macpona.p on the Unity of Organization as exhibited in the Skeleton of 
INITHAIS) aazeonebacessweesnnestdelscasarea¥a Cds tng enahee Wes @irainne sates Bodiaecdasweniseds 
Mr. Joun Buackwatt on Periodical Birds observed in the Years 1844 and 1845 
near Llanrwst, Denbighshire, North Wales............+.. RECAP iaSacvannate 
Mr. Joszru Bonomi on a Gigantic Bird sculptured on the Tomb of an Officer 
of the Household of Pharaoh  ............csssccssevecsctonecsescscscnsnseneesces aise sais 
Mr. W. C. Trevetyan on the Discovery of Guano in the Faroe Islands ...... 
Mr. J. O. Westwoon’s Remarks on Entomology ........cessesseeerseresees RETR AAS 
Mr. Rosert Baxu on Noises produced by one of the Notonectid@ .......s+0e0 
Messrs. ALDER and Hancocx on a new Genus of Mollusca Nudibranchiata ... 
Mr. Cuarztes WiLi1am Peacu on the Marine Fauna of Cornwall..... ......... 
Professor E. Forses’s Notice of Additions to the Marine Fauna of Britain, dis- 
covered by Robert M‘Andrew, Esq. since the last Meeting of the Association. 
Rev. J. B. Reape on the Cilia and Ciliary Currents of the Oyster .........+.+... 
Professor E. Forszs on the Distribution of Endemic Plants, more especially 
those of the’British Islands, considered with regard to Geological Changes... 
Mr. A. Henrrey on the Development of Vegetable Cells ....... contac sesanane ds 
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