574 Correspondence — Mr. J. F. Walker. 



all rare and unusual rocks of special lithological, mineralogical and chemical interest, 

 examples of ore-deposits and of veinstones of all kinds, with their encasing rocks. 

 As far as possible these collections should be limited to specimens of a size convenient 

 for examination, and be accompanied with sections prepared for microscopic study. 

 In the arrangement of all these materials regard should be had to their natural 

 associations rather than to theoretical notions or artificial classifications, so that they 

 may be studied not only petrographically but geognostically. 



II. Collections illustrating the fauna and the flora of the Palaeozoic and more recent 

 periods, particularly of such horizons as present a more critical interest to palaeonto- 

 logists from the first appearance or the disappearance of important groups of organic 

 forms. It has appeared to the Committee named below that the organic remains of 

 the Cambrian, Taconic or so-called Primordial strata merit especial attention in this 

 connexion. 



These various collections should be explained as fully as possible by labels, 

 catalogues, monographs and maps. 



III. Collections of geological maps, and also of sections and models, especially such 

 as serve to illustrate the laws of mountain structure. In the geological maps regard 

 should be had to various questions which deserve the special consideration of the 

 Congress, such as the scales best adapted for different purposes, the colours and 

 symbols to be used, and the proper mode of representing superficial deposits conjointly 

 with the underlying formations. A discussion of these will prepare the way for 

 improved general geological maps of the continents. 



In pui'suance of the above plan, the American Association for the Advancement of 

 Science during its annual meeting at Buffalo, under the presidence of Prof. William B. 

 Eogers, unanimously adopted the following resolution on the 25th of August, 1876 : — 



^^ Re solved J That a Committee of the Association be appointed by the Chair to 

 consider the propriety of holding an International Congress of Geologists at Paris, 

 during the International Exhibition in 1878, for the purpose of getting together 

 comparative collections, maps and sections, and for the settling of many obscure points 

 relating to geological classification and nomenclature. And that to this Committee 

 be added our guests. Prof. T. H. Huxley of England, Dr. Otto ToreU of Sweden, 

 and Dr. E. H. von Baumhauer of the Netherlands, who shall be requested to open 

 negociations in Europe, looking to a full representation of European geologists at the 

 proposed Congress. The said Committee to consist of Prof. William li. Eogers, 

 Messrs. James Hall, J. W. Dawson, J. S. Newberry, T. Sterry Hunt, C. H. 

 Hitchcock, and R. Pumpelly in behalf of the Association, with the addition of Prof. 

 T. H. Huxley, Dr. Otto Torell, and Dr. E. H. von Baumhauer." 



On the same day, at a meeting of the Committee, Prof. James Hall was elected 

 Chairman, and Dr. T. Sterry Hunt, Secretary. It was then resolved to prepare the 

 present circular, to be printed in English, French, and G-erman, and distributed to 

 geologists throughout the world, asking their co-operation in this great work of an 

 International Geological Exhibition and an International Geological Congress to be 

 held at Paris in 1878; the precise date of the Congress to be subsequently fixed. 



All those interested in this project are invited to communicate with any one of the 

 following members of the Committee : — 



Prof. T. H, Huxley, London, England. 

 Dr. Otto Torell, Stockholm, Sweden. 

 Dr. E. H. von Baumhauer, Harlem, Holland. 

 Dr. T. Sterry Hunt, Boston, Mass., U.S.A. 



Philadelphia, U.S.A., T. STEERY HUNT, Secretary. 

 Oct. 21th, 1876. 



NEW BRITISH BEACHIOPODA. 

 Sir, — During a recent visit to Abbotsbury, Dorsetshire, I obtained 

 from the Upper Corallian red ferruginous rock some specimens of 

 Terehratula subsella, Leymerie. I think this species has not been 

 discovered in England before. The other Brachiopoda which occur 

 in this rock are: — Waklheimia lampas, Sow., Waldheimia Dorsetensis, 

 n.sp., Bhynchonella pinguis, Tioemer, zzzEJiyn. coraUina, Leym. These 

 species will be figured in Mr. Davidson's Jurassic Supplement. 



J. F. Walkek. 



