REVIEWS 391 



the most part difficult to procure, and are in large measure inaccessible. In 

 the fine discrimination of specific forms Simpson seems to have excelled, 

 but his descriptions are unaccompanied by illustrations, which has rendered 

 them difficult to follow. 



In his republication of the descriptions of these forms the editor has had 

 access to the original types, which will be illustrated, and with his critical 

 notes the contribution will be of inestimable value to all students of this 

 highly interesting fauna. For the preparation of such a work as this the 

 editor is the most eminently fitted of any English paleontologist. The work 

 is planned to be complete in about 16 parts of from 12 to 16 plates each. 

 The first and second parts are now published, containing 23 plates with 



the descriptions of 22 species. 



S. W. 



An Introduction to the Geology of Cape Colony. By A. W. Rogers, 

 Sc.D., AND A. L. DuToiT, A.B. 2d ed. London: Longmans, 

 Green & Co., 1909. Pp. 491, 25 plates, 29 text figures, and a 

 colored map. 

 The first edition of this work appeared in 1905. During the five years 

 which have passed since its appearance considerable advances have been 

 made in the knowledge of Cape geology, and in the light of this new infor- 

 mation, the work has been revised and partially rewritten. The most 

 notable changes occur in those parts of the book which deal with the ancient 

 rocks in the north of Cape Colony, with the Dwyka conglomerate, the cor- 

 relation of the Karroo system, the intrusive dolerites, and the famous 

 volcanic pipes. The revision also embraces important advances in paleon- 

 tology. An entirely new chapter on " Economic Geology" has been added, 

 while, in order to keep the book about the same size as before, the less 

 important parts of the first edition have been reduced or omitted. 



The chief formations of Cape Colony are the old pre-Cape rocks, the 

 Cape system. Karroo system, and the Cretaceous, and to these the bulk 

 of the volume is devoted, with, however, chapters on the Tertiary-Quater- 

 nary deposits, intrusive dolerites, the diamondiferous volcanic pipes, geo- 

 logic history of the colony, and economic geology. The greatest emphasis 

 has been placed upon the Karroo system which, on account of its peculiar 

 and profoundly significant features, is of special importance to geologists 

 and paleontologists the world over. A chapter on the reptiles of the Karroo 



is contributed by Professor Broom. 



R. T. C. 



