556 Reviews — Prof. E. SuWs Oeology of Ireland. 



These figures convey an idea of the extreme richness of the 

 Mollucan fauna of the Paris Basin, and show it to be at least three 

 times as rich in species as the Eocene and Oligocene beds of the 

 English area. This richness in species is also borne out in the vast 

 numbers of individuals of the more common forms ' whose name is 

 legion ' in some spots. 



We cannot close this brief notice without referring to the vast 

 labour entailed by the preparation of a list of upwards of 3000 

 species, giving the range of each. Of course the works of Cossmann, 

 Deshayes, and many others, have been used to aid this compilation, 

 but the critical knowledge and care possessed and exercised by the 

 authors could alone insure this part of the work being carried out 

 correctly. The authors acknowledge that they have had valuable 

 assistance in correcting their proofs from Mr. F. A. Bather, M.A., 

 F.Gr.S., and in their biography from Mr. C. Davies Sherborn, F.G.S. 

 There is an Index of Species and a General Index is also provided. 



We heartily congratulate the authors on this valuable piece of 

 work, and the Geologists' Association upon their courage in incurring 

 the very large expense of printing it, which we sincerely trust they 

 may recover on the sale of this very useful Memoir. 



in. — The Physical Geology and Geogkaphy of Ieeland. By 

 Professor Edwakd Hull, M.A., LL.D., F.R.S., Second Edition, 

 Revised, pp. 328. (London : Edward Stanford, 1891. Price 7s.) 



A FTEE an interval of thirteen years the author has given us a 

 _0_ revised edition of bis useful book, and, as he remarks, it 

 comes by a happy coincidence concurrently with the completion of 

 the Geological Survey of the country with which it deals. In bulk 

 the work is larger by 37 pages, and it contains three more illustrations. 

 Considerable portions of the work remain as in the original edition, 

 but here and there corrections and additions have been made ; the 

 more important supplementary matter relating to the Archsean rocks, 

 the Devonian rocks, the Volcanic rocks of Antrim, and to " the 

 invasion of Ulster by a great ice-sheet from the Grampian Mountains 

 of Scotland." 



The work was reviewed at considerable length in the Geological 

 Magazine for March and April, 1878 (pp. 121 and 167), and it is 

 therefore needful only to draw attention to a few points in our 

 present notice. 



In the former edition Prof. Hull commenced with the Cambrian 

 rocks ; he now decides to " commence with the Archeean rocks, 

 which are the oldest, and follow the course of the geological record 

 downwards" (some would prefer to say upwards). A couple of 

 pages serve to tell all the author has to say about these oldest of 

 rocks, which consist chiefly of " gneiss with masses of schist." The 

 principal areas occupied by these rocks are shown on the neat little 

 geological map which accompanies this work, and the author candidly 

 states, though in language that savours of a " bull," that with regard 

 to his former conclusion (in 1882) that the granitic and gneissic 



