38 Reviews — Mineral Resources of the United States. 



orders into which the Beptilia may be divided no less than eleven 

 became extinct before the end of the Secondary Period. 



In the succeeding chapters an account is given of the distribution 

 in time and space of the extinct forms, together with a very clear 

 account of the different modifications undergone in the various groups 

 in the course of their adaptation to an aquatic mode of life: the 

 chapter dealing with this subject is perhaps the most generally 

 interesting in the book. 



The remainder of the volume is occupied by a series of chapters 

 on the different orders in which some or all of the members have 

 adopted an aquatic life. These orders are : the Sauropterygia ; the 

 Anomodontia, among which Lystrosaurus seems to have been at least 

 semi-aquatic ; the Ichthyosauria ; the Proganosauria ; the Protoro- 

 sauria ; the Squamata ; the Thalattosauria; the Rhynchocephalia ; 

 the Parasuchia ; the Crocodilia ; and, finally, the Chelonia. The 

 author, naturally, where possible refers to American types to illustrate 

 his points, and most of the illustrations, which include numerous 

 restorations, are likewise of American species. 



This book should certainly be read by all who are interested in 

 reptiles, living or extinct, for, although especially devoted to aquatic 

 types, it gives a good idea of the immense diversity of form that has 

 been attained by members of the class. 



C. W. A. 



II. — Reptiles and Bateachians. By E. G. Boulengee, F.Z.S. 

 pp. 278, with 79 photographic plates (one coloured) and 25 

 text- figures. London : Dent & Sons, Ltd. Price 16s. net. 



ALTHOUGH this book refers almost exclusively to living reptiles 

 and batrachians, and more especially to their habits, neverthe- 

 less it is of considerable importance to the palaeontologist, since 

 a knowledge of the habits of recent forms is often valuable in giving 

 suggestions for the explanation of peculiarities in the structure of 

 extinct types. Mr. E. G. Boulenger, as Curator of the Lower 

 Vertebrates at the Gardens of the Zoological Society, has had 

 exceptionally good opportunities for observing the habits of the 

 animals in question, and he has made use of them in this volume. 

 The illustrations are for the most part a series of fine photographs, 

 mostly taken from the life of Mr. W. S. Berridge, P.Z.S., and 

 excellently reproduced. 



iii. mlneeal b.esotjeces of the united states, 



Calkndae Yeae 1913. 



THIS valuable work is now issued by the Geological Survey in 

 instalments, chapter by chapter, in order to secure promptitude 

 of publication. It is divided into two parts, dealing respectively 

 with Metals and Non-metals. The pagination of the chapters in 

 each is consecutive, and title-pages, tables of contents, and indices 

 are supplied to those wishing to assemble and bind together the 

 component chapters. Although compiled from the point of view 

 of the United States, the work appeals to all interested in the 



