CONTENTS. 



SESSION CXVIII. 



Opening Address, by Professor Sir Wm. Turner, M.B., LL.D., F.R.S., 



President, ........ 1 



On the occurrence of Sowerby's "Whale {Micropteron bidens) in the Firth 

 of Forth, by Sir Wm. Turner, M.B., LL.D., F.R.S., Professor of 

 Anatomy in the University of Edinburgh, .... 5 



Notes on the White-beaked Dolphin {Delphinus {Lagenorhynchus) alhi- 



rostris), by Professor Sir Wm. Turner, M.B., LL.D., F.R.S., . 15 



Notes on the Skull of an aged male Hyperoodon rostratus from Shetland, 



by Professor Sir Wm. Turner, M.B., LL.D., F.R.S., . . 19 



On the Structure and Classification of the Asterolcpidoe, by Dr R. H. 



Traquair, F.R.S., F.G.S. [Plates L, IL], ... 23 



Homosteus, Asmuss, compare with Coccosteus, Agassiz, by Dr R. H. 



Traquair, F.R.S., F.G.S. [Plate IIL], .... 47 



On a Tract of modified Epithelium in the Embryo of Sepia, by William 



E. HoYLE, M.A., . . . . . . .58 



A Theory of the Parasitic Habit of the Cuckoo, by J. Arthur Thomson, 



M.A., F.R.S.E., 60 



Variation in the Plumage of the Common Rook {Corviis frugilegits, Linn.), 



by Professor Duns, D.D., F.R.S.E., ..... 68 



On some Wasps' Nests from South America, by Professor Duns, D.D., 



F.R.S.E. (Specimens ex^ ibited), . ' . . . .71 



Notes on a Collection of Birds and -^ggs from the Republic of Paraguay, 



by J. J. Dalgleish, M.B.O.U., ..... 73 



Additional Notes on some British Carboniferous Lycopods, by R. Kidston, 



F.R.S.E., F.G.S. [Plate IV.], 88 



On some of the Modes of Formation of Coal Seams (Abstract), by J. G. 

 GooDCHiLD, H.M. Geol. Survey, F.G.S., Acting Instructor in Geology 

 and Mineralogy to the Royal Geographical Society, . . " . 97 



Zoological Notes, by Frank E, Beddard, M.A., F.R.S.E., F.Z.S., 

 Prosector to the Zoological Society of London, Lecturer on Biology 

 at Guy's Hospital. [Plate V.], ..... 101 



Notes on Pallas's Sand-grouse {Syrrhaptes paradoxus) in Scotland during 

 the recent great westward movement of the Species, by William 

 Evans, F.R.S.E., . . . , . . .106 



The Ancient Lakes of Edinburgh, by James Bennie, Geological Survey 

 of Scotland, and Thomas Scott, F.L.S., Naturalist to the Fishery 

 Board of Scotland, . . . . . . .126 



Notes on a few Crustacea and Mollusca new to the Fauna of the Forth, 



with Exhibition of Specimens, by Thomas Scott, F.L.S., . . 154 



Notes on the Larval Stages of Motclla, by George Brook, F.L.S. 



[Plate VI.], 156 



Notes on the British Species of Lcpadogastcr, and on the Development 

 of the Vertical Fins, by George Brook, F.L.S., F.R.S.E. 

 [Plate VIL], 161 



Note by William Evans, F.R.S.E., on a Specimen of the Red-footed 

 Falcon {Falco vespcrtimis, L.). Exhibited to the Society 20th 

 February 1889, . . . . . . .168 



