378 Correspondence. 



taining sliells about midway between tbe Bay and Bryn Gosol, not 

 far from the turnpike-road. Whilst referring to this district, Mr. 

 Mackintosh's paper suggests my pointing out an example of a higher 

 coast level, as indicated by Pholas -borings. A friend informs me 

 that he has seen these markings high up on the mountain to the 

 west of Conway, but I have no record of their exact altitude. 



Eeferring to Mr. Green's letter, I would remark that the Llandudno 

 district affords clear evidence of the superposition of Glacial drift on 

 the white sands or clays resting on the Carboniferous Limestone; 

 though, it must be admitted, this is not so obvious in Staffordshire. 

 Eegarding the source of materials, the broken chert beds that are 

 near Llandudno associated with these deposits, seem to indicate a 

 derivation from the Millstone Grit which, along the north coast of 

 Wales, contains extensive beds of chert. The Bunter beds in North 

 Wales are so invariably red that I scarcely think it probable they 

 can have supplied any materials for the white beds underlying the 

 Boulder-clay drift in that district. 



Gkorge Maw. 



Benthall Hall, Broselet, 

 July 2nd, 1867. 



SOME EEMARKS ON THE EEPORT OF PROFESSOR OWEN'S PAPER 



ON FISH REMAINS FOUND IN THE NORTHUMBERLAND 



COAL-FIELD.i 



To the Editor of tJie Geological Magazine. 



Sir, — I beg to be allowed to make a few remarks on the Report 

 which appeared in the July number of the Geological Magazine of 

 Professor Owen's paper, " On the Dental characters of Genera and 

 species, chiefly of fishes, from the Low Main Seam and shales of 

 coal, Northumberland," (read before the Odontological Society on 

 the 3rd of June last). 



I have been engaged for many years in collecting fish and other 

 remains from the Northumberland Coal-field, and have obtained a vast 

 number of specimens, both entire and fragmentary, from the shale in 

 connection with the Low Main Seam at Newsham, West Cramlington, 

 and other places. Mr. T. Craggs, who was cognizant of my oper- 

 ations, gathered, a short time ago, a few specfimens of fish-remains, 

 principally teeth, from the same localities ; and sent prepared micro- 

 scopical sections of some of them to Professor Owen, who has, from 

 these rnaterials, described twelve or thirteen new genera, several of 

 which I believe to be founded upon remains previously described, 

 while others are, apparently, the result of an examination of the 

 varied sections of the same forms. 



I believe there are no remains noticed in Professor Owen's list, so 

 far as the concise account in the Report enables me to judge, of which 

 there are not numerous specimens in my collection ; and as I have 

 had the advantage of examining these under varied conditions — not 

 merely of sections — I am in a position to speak with some degree of 



» See Geol. Maq., July, p. 323. 



