182 \ ■. Reviews — A Mystery Grinoid. 



in Cambridge, by which he had access to the libraries of the Cambridge 

 University, the Geological Society of London, the India Office, the 

 British Museum, the Imperial Institute, the Science Museum, the 

 Boyal Geographical Society, and the Institute of Civil Engineers. 

 Thanks are also recorded by the author for assistance given him by 

 many State Geologists who have aided in his work. 



The first volume (dated 1917) is devoted to a Bibliography of 

 Indian Geology and Physical Geography, under authors' names, 

 prefaoed by 23 pages of abbreviated titles used in the work (all 

 alphabetically arranged). 



The second volume (dated 1918) contains an "Annotated Index of 

 Minerals of Economic Value"; this is intended to be used in 

 conjunction with the bibliography (which, indeed, is included and 

 really forms part of this work). 



The figures inserted in brackets after the observer's name 

 correspond to the serial number allotted to each author, followed by 

 the number of the page on which the reference will be found. 



A listof works dealing generally with the distribution of economic 

 minerals in India is given under provinces and authors, for India, 

 Burma, Madras, Punjab, and Rajputana, the names of minerals being 

 arranged alphabetically: e.g. Alum, Amber, Chromite, Coal, Copper 

 ore, Corundum, Diamonds, etc., so that no separate index is required. 



Much information relating to the mineral resources of the country 

 collected within recent years is stored up in the progress reports and 

 correspondence files of the Geological Survey Department in Calcutta, 

 where it may be studied by those who are interested in the subject, 

 either in its scientific or commercial aspects. 



The matter comprised under the general heading "Building 

 Materials" (pp. 27-62) is of course very complex in its nature, 

 embracing descriptions and localities for limestones, sandstones, 

 slates, quartzites, granites, marbles, basalts, gneissic rocks, laterites, 

 serpentinous limestones, dolomites, etc., in great variety. 



By this valuable compilation Mr. T. la Touche has conferred a great 

 service on all who are seeking information on Indian geology. He 

 has given us in these volumes a ready reference to the authors of all 

 books and papers, not only relating to the geology and physical 

 geography of our Indian Empire, but also to its economic minerals 

 and rocks and the localities in which they are found. It is a book 

 which should find a place in the reference works of every scientific 

 library, but is much too large to carry in one's handbag. 



III. — A Mystery Crinoid. 

 On Mystic oobjnus, a new genus of Silurian Crinoidea. By Frank 

 Springer. Amer. Journ. Sci., xlvi, pp. 666-668, pi. ii, 

 Nov. 1918. 



rpHE genotype is Mysticocrinus ivilsoni, of which the holotype and 

 X a fragment were obtained by Dr. Derrick E. Wilson from the 

 Laurel formation near St. Paul, Indiana, and are in the Springer 

 Collection at the U.S. National Museum. The crown, with stumpy 

 infolded arms, is like a wrinkled pea in size and shape. The cup 



