iv YORKSHIRE TYPE AMMONITES Dec. 



Of the volumes to be edited a few details may be given. The 

 title-page of Young & Bird's first work reads : — 



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 : Illustrated with numerous Engravings : 

 by the Rev. George Young, A.M., and John Bird, Artist. Whitby. 

 1822. This will be quoted as " Young & Bird, 1822." The title- 

 page of their 2nd Edition, 1828, is practically the same : it will be quoted 

 as " Young & Bird, 1828." There are numerous discrepancies between 

 the two editions — particularly through alteration in the names of species. 



The title-page of the 2nd edition states that John Bird was then 

 Curator of the Whitby Museum. 



The title-page of Simpson's first work reads thus : — A Monograph 

 of the Ammonites of the Yorkshire Lias ; containing the specific 

 characters and popular notices of more than 100 species ; with 

 references 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. London : Simpkin, Marshall and Co., and 

 all Booksellers. 1843. 



The preface is dated February, 1843 ; and the authorities of the 

 British Museum kindly give the information that their copy was received 

 July 8th, 1843. Publication may have preceded this date by some 

 time, but even this date will give Simpson's species priority over all 

 of d'Orbigny's (Terr. Jur., Ceph. ; Pal. Fran9. L) after p. 192 (1844), 

 and probably after p. 144 (second issue in 1843). 



This work of the Yorkshire author will be referred to as " Simpson, 

 1843." 



The title-page of Simpson's next work is : — ^The Fossils of the 

 Yorkshire Lias ; Described from Nature. With a short outline of the 

 Geology of the Yorkshire Coast. Illustrated with sections ; and 

 intended as a Guide to Strangers. By M. Simpson, Lecturer on Natural 

 Science, and Curator of Museums. London : Whittaker and Co., Ave 

 Maria Lane. Whitby : Silvester Reed. 1855. 



This work will be quoted as " Simpson, 1855." There is no copy 

 in the British Museum, nor in the Bodleian Library, Oxford, so that a 

 more exact date of publication is not known. The work is, however, 

 not so difficult to procure as the 1843 publication. 



A second edition of this work was published nearly thirty years 

 later. Its title-page reads : — ^The fossils of the Yorkshire Lias, described 

 from Nature, with a carefully-measured section of the strata, and the 

 fossils peculiar to each. By Martin Simpson, Lecturer on Natural 

 Science, and Curator of the Whitby Museum ; Author of a Guide to the 

 Geology of Yorkshire. Second Edition. Whitby : Printed by Forth 

 and Son, Flowergate. Sold at the Museum. London : John Wheldon, 

 Natural History Bookseller, 58, Great Queen Street, Lincoln's Inn 

 Fields, 1884. 



This work will be quoted as " Simpson, 1884." It is easily obtain- 

 able : and therefore the section of the strata which he gives will be used 

 as a basis for fixing the ])osition of species (see below, p. xvi.) 



