DESCRIPTION OF SPECIMENS. 45 



The majority of the British Museum specimens are included in 

 the following collections, while some were presented by Dr. Murray, 

 Mr. J. Leckenby, Mr. J. Williamson, Mr. S. P. Pratt, and others : 



Bean Collection. Egerton Collection. 



Beckles Collection. Mantell Collection. 



Bowerbank Collection. Morris Collection. 



The principal localities are Gristhorpe Bay, Scarborough (often 

 used in a wide sense and in some cases including localities nearer 

 Gristhorpe Bay than Scarborough), Cloughton Wyke, Haiburn 

 Wyke, Whitby, and Saltwick. (Vide Text-fig. 1, p. 17.) 



