Geology. 249 



earliest faunas in the section " is shown " to have been a progres- 

 sion from a brachiopod to a pelecypod facies. The gradual char- 

 acter of this replacement has been remarked by most paleontol- 

 ogists who have studied the faunal succession. It is without 

 marked interruption at any point, so that subdivisions appro- 

 priate for recognition are not clearly apparent, and there is room 

 for differences of opinion as to where delimitation should be 

 made." 



3. EinfiXhrung in die Palaontologie ; von Dr. Gustav Stein- 

 mann. Pp. 1-466, figs. 1-818. Leipzig, 1903 (Wilhelm Engelmann). 

 — This elementary treatise on paleontology is written by one of 

 the authors of the " Elemente der Palaontologie " of Steinmann 

 and Doderlein published in 1890, and appears to be an abbrevia- 

 tion and revision of that work, using the same illustrations, with 

 an addition of fifty pages on fossil plants, and numerous new 

 figures. The reduction of a work attempting to introduce the 

 reader to a knowledge of plants and animals of past geological 

 time to 466 pages, makes it necessary to mention only the more 

 conspicuous families, while for each family only the more charac- 

 teristic are named and very brief descriptions given. It is too 

 technical for general reading and not complete or full enough to 

 be of much use in the laboratory, but it may serve as a means of 

 gaining a superficial knowledge of the names of the more con- 

 spicuous genera met with in treatises on geology and thus be 

 of use to the geologist or general student as a means of gain- 

 ing definite ideas of the forms of fossils. It is well printed and 

 the illustrations are chosen to give a comprehensive idea of the 

 diagnostic characters of the forms illustrated. h. s. w. 



4. The Structure of the Piedmont Plateau as shown in Mary- 

 land ; by Edward Bennett Mathews. — Attention is called to 

 the fact that fig. 1, p. 150, in the article by E. B. Mathews, is 

 printed in inverted position. The figure is here repeated inserted 

 in its correct position. 



1 



5. Western Australia Geological Survey. — Three bulletins 

 have recently been issued as follows : 



No. 8. Lennonville, Mount Magnet, and Boogardie, Murchi- 

 son Goidfield ; by Chas. G. Gibson. 33 pp. with map. 



No. 9. Geological Features and Mineral Resources of North- 

 ampton ; by A. Gibb Maitland. 28 pp. with map and sections. 



No. 10. Descriptions of Carboniferous fossils from the Gas- 

 coyne District, Western Australia ; by R. Etheridge, Jr., 41 pp. 

 6pls. 



Am. Jour. Sci.— Fourth Series, Vol. XVII, No. 99. — March, 1904. 

 11 



