Phosphatic Deposit at Putton, in Bedfordshire. 121 



call this fossil by a name which he knows to be the wrong one ? 

 On referring to Prof. Morris's catalogue, I find that O. macro- 

 ptera occurs in the Gault of Oxfordshire, in the Lower Greensand 

 of Atherfield, and in the Greensand of Farringdon, where I 

 found specimens during a recent visit. Mr. Seeley next states 

 that he has seen no such shells as Exogyra conica &c., adding, 

 " though I have long had other species of those genera in the 

 Woodwardian Museum." He ought to have given a list of the 

 specimens, which I presume, from his statement, have been 

 presented by him to the University Collection. 



X. With regard to this paragraph I can only say that, in my 

 paper read before the British Association, I distinctly mentioned 

 that fishes from the Kimmeridge Clay at Ely, specifically iden- 

 tical with those from Potton, were exhibited in the Woodwardian 

 Museum, and that I think the rolled condition of the Potton 

 specimens is a sufficient " reason for thinking them other than 

 tenants of the sea of the time." I must confess that I am at a 

 loss to understand the purpose of Mr. Seeley's reference to the 

 existence of named specimens of these fishes in the University 

 Museum, unless he considers that no one has a right to consult 

 a public museum without acknowledging each occasion on which 

 he may have derived information from it. As regards the spe- 

 cimens referred to in my paper, I had many of them in my 

 possession and had determined them before any fossils from 

 Potton were exhibited or, so far as 1 know, contained in the 

 Woodwardian Museum. 



XI. I will not be behind Mr. Seeley in confessing what I dare 

 not call the only mistake in my paper. There occur in this bed 

 rolled fragments of a rock composed almost entirely of shells ; 

 the specimens found were very much decomposed, and presented 

 precisely the aspect of fragments of the CV/rena-bed. Since 

 then, more boulders of this rock have been found, in a better 

 state of preservation. On breaking these, I also have found 

 specimens of Cardiuni; therefore I will admit that the specimens 

 1 mentioned in my paper probably contain the same shells. 

 But I think that there is sufficient evidence of the denudation 

 of the Wealden in the occurrence of the rolled bones of lyuano- 

 don &c., and in the rolled fruits and wood. The wood exists 

 in two different states of mineralization, as I remarked in my 

 paper. Mr, Seeley states that he has shown in his paper " that 

 the material of the deposit came from the east." I suppose he 

 refers to one of his unpublished papers. 



XII. The species described by me as Sphcera Sedgivickii, if 

 not a Sphcera, is probably the type of a new genus ; if, however, 

 it should hereafter be proved to be a Cyprina, I have no doubt 

 that it will be found to differ considerably from C. angulata, Sow., 



