656 Notices of Memoirs — T/w British Association. 



ItaJpli BicJiardson, F.R.S.E. — Points of Dissimilarity and Eesem- 

 blance between Acadian and Scottish Glacial Beds. (See p. 

 517.) 



W. F. Stanley. — Upon the Improbability of the Theory that former 

 Glacial Periods in the Northern Hemisphere were due to the 

 Eccentricity of the Earth's Orbit, and to the Winter Perihelion 

 in the North. (See p. 518.) 



Bev. E. Hill, M.A.— On Ice-Age Theories. (See p. 513.) 



Prof. J. S. Newberry, M.D. — Recent Discoveries of New and Ee- 

 markable Fossil Fishes in Ohio and Indiana. (See p. 523.) 



(September 1, 1884.) 



Professor Hall, LL.D. — On the Fossil Eeticnlate Sponges constituting 



the Family Dictyospongidce. (See p. 557.) 

 Professor Hall, LL.D. — On the Lamellibranchiate Fauna of the 



U^jper Helderberg, Hamilton, Portage, Chemung and Catskill 



groups (equivalent to the Lower, Middle and Upper Devonian 



of Europe) ; with especial reference to the arrangement of the 



Monomyaria, and the development and distribution of the 



species of the genus Leptodesma. (See p. 559.) 

 Professor T. G. Bonney, D.Sc, F.B.S. — On the Archaean Eocks of 



Great Britain. (See 6n>/ abstract, p. 521.) 

 Dr. T. Sterry Hunt, F.B.S.— The Eozoic Eocks of North America. 



(Printed in full, see p. 506.) 

 Professor J. F. Blahe, M.A. — First impressions of some Pre-Cam- 



brian Eocks of Canada. 

 Professor J. D. Dana, LL.D. — On the Southward Ending of a great 



Synclinal in the Taconic Eange. (See p. 473.) 

 H. J. Johnston- Lavis. — Notice of a Geological Map of Monte Somma 



and Vesuvius. 

 W. Topley. — Eeport upon the National Geological Surveys of Europe. 



(Printed in full, p. 447.) 

 TT. WhitaJcer, B.A., F.G.S.— The Value of Detailed Geological Maps 



in relation to Water-Supply and other Practical Questions. (See 



p. 468.) 

 Prof. V. Ball, M.A., F.E.S.— On the Mode of Occurrence of Precious 



Stones and Metals in India. (See p. 516.) 

 Dr. C. Le Neve Foster, H. M. Inspector of Mines. — What is a Mineral 



Vein or Lode ? (See p. 513.) 



(September 2, 1884.) 



G. K. Gilbert. — Plan for the Subject-Bibliography of North American 



Geology. (See p. 562.) 

 Prof. E. W. Claypole, B.A., B.Sc, F.G.S.~On some remains of Fish 



from the Upper Silurian Eocks of Pennsylvania. (See p. 519.) 

 Prof. 0. C. Marsh. — American Jurassic Mammals. 

 Prof T. B. Jones, F.B.S.— On the Geology of South Africa. (See 



p. 476.) 

 Principal Sir W. Daioson, C.M.G., LL.D., F.B.S.— On the more 



Ancient Land Floras of the Old and New Worlds. (See p. 469.) 



