32 Reviews — Walcotfs Lower Cambrian or Olenellus Fauna. 



1 distinct (Lagena) and 5 indistinct sections of Foraminifera. The 

 distribution of these species in the Upper-Silurian formations of 

 Siberia, Estland and Oesel, Scandinavia, Britain, China, and America 

 is shown in a table at p. 55. Strophomena englypha, Phacops qiiadri- 

 lineata, Favosites Gotlandica, F. Forbesi, Alveolites Labecliei, HeiioUtes 

 inter stincttis, and Halysites catenularia have the widest range. Five 

 quarto plates of numerous figures illustrate this interesting memoir. 



T. E. J. 



12, IB ^v- 1 :E3 "W s. 



I. — The Fauna of the Lower Cambrian or Olenellus Zone. 

 By Charles Doolittle Walcott, F.G.S., of the Smithsonian 

 Institution, Washington, D.C., U.S.A. Extract from the Tenth 

 Annual Report of the Director (1888-89). Washington, 1890 

 (issued 1891). U. S. Geological Survey. Ito. pp. 511-774, 

 Plates xliii.-xoviii. 



THE publications of the Geological Survey of the United States 

 of America have long been famous for their illustrations and 

 their typography ; for the vast amount of economic information they 

 contain as regards the stratigraphical geology, the physical features, 

 the agricultural and mineral resources contained in each State. Nor 

 has science been neglected, for there are but few volumes, out of the 

 long and splendid series already issued, which have not contained 

 most valuable contributions to the palteontology of some group of 

 organisms, or the fauna of some series of rocks. This is all the 

 more honourable to the present Director, Major J. W. Powell, 

 because it is an open secret that, like Gallio, " he cares for none of 

 these things," and might, if ungenerously disposed, have placed great 

 obstacles in the way of the progress of paheontology. We have 

 now to thank him for enabling Mr. C. D. Walcott, the author of the 

 memoir before us, to bring out in a suitable manner, one of the 

 finest pieces of work which has issued from the Government 

 Printing Office, Washington, already famous for its productions, so 

 generously distributed by the United States Government to men of 

 science all over the world. 



The author, with the modesty of true merit, prefaces his work 

 (pp. 516-524) with the names of some forty authors and over one 

 hundred papers bearing upon Cambrian geology and palaeontology. 

 Mr. Walcott thus defines the title of his work : — 



" A living fauna, as known to the zoologist, is the assemblage of 

 animals embraced within a given geographic province or area, and 

 includes all animal life associated on account of climate or phj'sical 

 boundaries. Some of the species may range from province to 

 province and form a part of several faunas, while others are limited 

 to a particular portion of some faunal area. 



" In the study of the extinct faunas, buried in the rocks, the same 

 general principles of classification prevail, with the added restriction 

 of vertical or time range as defined by the progressive zoologic 

 changes in the faunas. 



