390 REVIEWS 



The final subject, "Biogeography," is treated with great fulness (pp. 

 709-862), and takes up not only the general principles of biogeography, 

 but goes into considerable detail in reference to plant communities in 

 various climatic areas, tropical, subtropical, and temperate, in Alpine 

 regions and Arctic zones, and in desert regions both cold and warm. Under 

 "Zoogeography" the aquatic fauna is discussed in relation to its distribu- 

 tion in deep sea or on continental shelves, and in relation to varying degrees 

 of salinity and warmth of water. The terrestrial fauna is considered in 

 reference to physiographic conditions, food conditions, and climatic con- 

 ditions. 



F. L. 



Yorkshire Type Ammonites. Edited by S. S. B'uckman. Part I. 

 London, William Wesley & Son. 



In this work the editor has undertaken to republish, with illustrations 

 and critical notes, the descriptions of Lias Ammonites from Yorkshire, 

 England, which were originally described by Young and Bird, and by 

 Martin Simpson. 



The original publication of Young and Bird, in 1822, appeared under 

 the title A Geological Survey of the Yorkshire Coast, "Describing the Strata 

 and Fossils Occurring between the Humber and the Tees, from the German 

 Ocean to the Plain of York, by Rev. George Young, A.M., and John Bird,, 

 artist." A second edition, wath many alterations from the first, appeared 

 in 1828. 



Martin Simpson's first work appeared in 1843 under the title A Mono- 

 graph of the Ammonities of the Yorkshire Lias, "Containing the Specific 

 Characters and Popular Notices of More Than 100 Species; with Refer- 

 ences to the Particular Beds and Localities Where Each Is to Be Found; 

 Including, Also, the Two Species of Nautilus. Described from Nature, 

 by Martin Simpson, Curator to the Geological and Polytechnic Society of 

 the West Riding of Yorkshire and Late Keeper of the Whitby Museum, 

 Lecturer on Geology, etc." In 1855 a second work by the same author 

 appeared under the title The Fossils of the Yorkshire Lias; Described from 

 N^ at lire, "with a Short Outline of the Geology of the Yorkshire Coast. Illus- 

 trated with Sections; and Intended as a Guide to Strangers. By M. Simp- 

 son, Lecturer on Science, and Curator of Museums." A second edition 

 of this work was published in 1884. 



These works, highly important as they are, have never received proper 

 consideration by students of Lias Ammonites, chiefly because they are for 



