CONTENTS. 



SESSION CXIII. 



Opening Address, by Archibald Geikie, Esq., F.R.S., . 



On the Structure of Sarcoclictijon, by W. A. Herdman, Esq., D.Sc, 

 F.L.S., Professor of Natural History in University College, Liver- 

 pool. [Plates I.-IIL], 31 



Notes on tlie Islands of Sula Sgeir, or North Barra and North Rona, with 



a List of the Birds Inhabiting them, by John Swjnburne, Esq., . 51 



Remarks on the Genus Megalidithys (Agassiz), with Description of a New 



Species, by DrR. H. Traquair, F.KS. [Plate IV.], . . 67 



Notes on a Second Collection of Birds and Eggs from Central Uruguay, 



by John J. ODalgleish, Esq., ..... 77 



Note on the Structure of the Body-Wall in certain Earthworms, by F. 



E. Beddard, Esq., M.A. (Oxon.), F.R.S.E., F.Z.S., . . 89 



Notes on the Genus GyracantMis (Agassiz), by Dr R. H. Traqxtair, 



F.R.S., 91 



On the Occurrence of the Little ,Gull {Larus minutus) in the Island of 

 North Uist ; with Remarks on the Objects of the International 

 Ornithologists' Congress at Vienna, and on Uniformity of Method in 

 recording Rare Species in future, by John A. Harvie-Brown, Esq., 

 F.R.S.E., F.Z.S., President, . . . . .105 



On the Occurrence of the Black Redstart {Eutidlla titys, Scop. ) at Pent- 

 laud Skerries, Pentland Firth ; along with a special plea in favour 

 of Ornithological Education, by John A. Harvie-Brown, Esq., 

 F.R.S.E., F.Z.S., 112 



List of Shells and Zoophytes from the Firth of Forth not hitherto 

 recorded in the Societv's Proceedings, by John R. Henderson, 

 Esq., . . . - 114 



On Scottish Fossil Cycadaceous Leaves contained in the Hugh Miller 

 Collection, by J. Theodore Richards, Esq., B.Sc, Falconer Memo- 

 rial Fellow of the University of Edinburgh. [Communicated by 

 Dr Traquair, F.R.S.], 116 



On a Specimen of Pecopteris (? polymorpha, Br«ngn.) in Circinate Verna- 

 tion, with Remarks on the Genera Spiropteris and Rhizomopteris of 

 Schimper, by Robert Kidston, Esq., F.G.S. [Plate V., Fig. 1], . 123 



On a New Species of Schutzia from the Calciferous Sandstones of Scot- 

 land, by Robert Kidston, Esq., F.G.S. [Plate V., Fig. 2], . 127 



On the Occurrence of Sabine's Gull (Xcma Sabinii, Sabine) in Adult 



Plumage in the Isle of Mull, by Edward Bidwell, Esq. , M. B.O.U. 131 



A Revised List of British Ophmroidea, by W. E. Hoyle, Esq., M.A. 

 (Oxon.), F.R.S.E., M.R.C.S., Naturalist to the "Challenger" 

 Commission, . . . . • • • .135 



On the Silver Districts of Colorado (Leadville and San Juan), by HenrV 



GuNN, Esq., Assoc. R.S.M., etc., ..... 15f> 



On Boulder-Glaciation, by Hugh Miller, Esq., A.R.S.M., F.G.S., 



Honorary Member of the Tyneside Field Club. [Plate VI. J, . 15(J 



The Breadalbane Mines, by James S. Grant Wilson, Esq., H.M. Geo- 

 logical Survey of Scotland, and H. Moubray Cadell, Esq., B.Sc, 

 H.M. Geological Survey of Scotland. [Plates VII. and VIII.], . 189 



The Harz Mountains: their Geological Structure and History, by 

 Henry Moubray Cadell, !Esq., B.Sc, Edin., H.M. Geological 

 Survey of Scotland. [Plates IX. and X.], . . . .207 



On the Classification of Animals, by J, Cossar Ewart, Esq., M.D., 



Regius Professor of Natural History in the University of Edinburgh, 266 



Note on "Deserted Spawning Grounds of the Herring," by J. Cossar 



Ewart, Esq., M.D., 270 



