Correspondence. 333 



layer of -white, false-bedded sand, of varying thickness. The Upper 

 Crag usually lies among a shingle composed of well-rounded flint 

 pebbles. The widely distinct character between the fine sand which 

 forms the matrix of the Lower Crag, and the general pebbly or 

 rubbly nature of the upper deposit, shows that the two strata were 

 deposited under different circumstances. The currents bringing the 

 material must have come from different directions. 



It is probable that the Crag at Mundesley and elsewhere in the 

 north-east of Norfolk, may belong to the period of the Upper Crag 

 rather than to the Lower. The fact that several feet of sand inter- 

 venes between the Crag and the Chalk, is confirmatory of this idea. 



[The Report on the Eev. J. Gunn's paper is postponed till our next Number.] 



coiaiaiESipoi^zDEnsroE. 



FISH IN THE OLD RED SANDSTONE. 

 To the Editor of the Gteological Magazine. 



Dear Sir, — Precluded, from want of local knowledge, from 

 taking any prominent part in the controversy at present pending as 

 to the relative positions of the Devonian and Old Eed Sandstone 

 formations, yet my geological associations are, to so large an extent, 

 connected with the latter formation, that I cannot be otherwise than 

 highly interested in the discussion. 



I have now for some years been employing a considerable portion of 

 my leisure hours in collecting and examining our Old Red Sandstone 

 fishes, and, perhaps, on this account feel not a little curious as to the 

 character and state of preservation, etc., of Mr. Pengelly's specimens 

 mentioned in Mr. Salter's communication in your Number of this 

 month (May) . 1 have never seen and it may be long before, if ever, 

 I have an opportunity of examining these ; I, therefore, may be 

 allowed, through the medium of your pages, to put a few queries as 

 to their bearing on the subject in dispute. 



Then, First : Are these specimens sufficiently distinct to be un- 

 douhtedly referred to any well-ascertained genus of Old Eed Sand- 

 stone fishes ? 



The scales of these fishes are often not a little puzzling; for 

 the same scale may present very different aspects from different 

 surfaces being exposed, while quite distinct scales, belonging to 

 very different fishes, occasionally present surfaces so similar to 

 each other as to be all but undistiaguishable. I have now before 

 me a fragment of limestone from Burdiehouse, showing some 

 moderately well preserved Bhizodus scales, also a very fine specimen 

 of Glyptolepis elegans from Gamrie. — These genera are very distinct, 

 the former belonging to the Lower Carboniferous, the latter to the' 

 middle and upper Old Eed Sandstone, yet on each of the specimens 

 I can point to a scale which, if detached, and these laid side by side 

 would, by any one, be pronounced specifically identical, so nearly do 

 they resemble each other. 



Now, if the Fhyllolepis from Meadsfoot be only, as stated by Mr. 



