INTRODUCTION 



Editorial 



In commencing the second volume of this publication it is the 

 Editor's pleasant duty to record further kind assistance. The authorities 

 of the Whitby Museum and of the Geological Survey Museum, London, 

 have continued their kindness. Prof. McKenny Hughes and Mr. H. 

 Woods have kindly forwarded from the Sedgwick Museum, Cambridge, 

 a considerable series of types named by Simpson, Bean and Leckenby, 

 described by the last-mentioned from the " Kelloway Rock," of Yorkshire. 

 Other species of Bean's have been submitted by the authorities of the 

 Museum of the Yorkshire Philosophical Society, York ; while Mr. H. 

 Wilfrid Jackson, F.G.S., has drawn attention to certain Yorkshire types 

 of Capt. Brown's in the Manchester Museum, and has sent specimens. 

 Mrs. Clarkson, widow of the late Dr. Clarkson, whose collection Simpson 

 mentions, has, in the most kind manner, forwarded for inspection the 

 whole of her late husband's collection of Ammonites, so that a systematic 

 search could be undertaken : several very important types have been 

 the reward. 1 Mr. C. Thompson has assisted in tracing certain types ; 

 Mr. C. Davies Sherborn, F.G.S., and Mr. L. F. Spath, F.G.S., have 

 forwarded useful information. To all those mentioned, and to Dr. Kitchin 

 and others for help in many ways, cordial thanks are tendered. 



The whereabouts of the greater part of the Jurassic type Ammonites 

 of Yorkshire are now known. The specimens referred to by Simpson 

 as in the Charlesworth Collection have not yet been traced ; and, as they 

 may be widely scattered, an appeal is hereby made to those who have 

 opportunity to search. The species are A. simplex, A. dejectus, A. alicenus 

 (Simpson, 1855, PP- 84, 85), probably all Oxynoticeras. There are also 

 a species mentioned as described from a dealer's collection, A. bispicatus, 

 (Simpson, 1855, p. 102, 1884, p. 105) a Deroceras, or a Microderoceras, 

 and the holotype of A. aculeatus, see No. 72. 



Bibliographic Details 



See Vol. I, p. hi. 



Two further works dealing with new species of Ammonites from 

 Yorkshire may be noticed. The first is entitled : Illustrations of the 

 Fossil Conchology of Great Britain and Ireland, with Descriptions and 



1 Just after these remarks were penned comes the sad news of the 

 death of Mrs. Clarkson. 



