238 Correspondence — Dr. Traquair — Mr. Dahjns. 



of Viesville, a query being appended to the genus on account of 

 want of evidence as to dentition. 



An inspection of the figures by which Prof, de Koninck's descrip- 

 tion is illustrated at once convinced me that not only was the query 

 justifiable, but that the fish in question could not possibly belong to 

 the genus Platysomus, the scales being represented as strongly 

 denticulated on their hinder margins, besides being more obliquely 

 arranged and differing essentially both in sculpture, and in the 

 position of their articular spines, from those characteristic of the 

 above-named genus. 



I accordingly wrote to Prof, de Koninck, expressing these convic- 

 tions, as well as my desire to see the specimens; whereupon my 

 distinguished friend, with great kindness and courtesy, at once 

 communicated my wish to the authorities of the Eoyal Museum of 

 Natural History in Brussels, to whom I am much indebted for the 

 opportunity of examining one of the specimens referred to. 



As I had suspected, I find that it belongs to the genus Eurynotus, 

 and to a species closely allied to, if not identical with, the well- 

 known' Eurynotus crenatus, of the Scottish Lower Carboniferous 

 rocks. This genus has hitherto been found only in Scotland 

 (Agassiz's " Eurynotus " tenuiceps, from the American Triassic rocks, 

 having turned out to be an Iscliypterus) , and the Viesville specimens 

 are therefore the first veritable examples of Eurynotus which have 

 been discovered elsewhere. In geological range, it remains, how- 

 ever, still confined to the Lower division of the Carboniferous 

 formation, not a scale of Eurynotus having been as yet found above 

 the horizon of the Millstone Grit. E. H. Traquaik. 



Edinburgh, 14th April, 1879. 



THE BRIDLINGTON AND SEWERBY GRAVELS. 



Sir, — The gravels overlying the Purple Boulder-clay at Bridling- 

 ton Quay have been generally considered as decidedly Post-glacial, 

 if not quite recent. 



I cannot now enter into a full discussion of the age of all these 

 gravels ; but a careful examination of the cliff has convinced me of 

 the Glacial age of a portion of them. I made some sketches of the 

 coast section last November, which I hope some day to publish ; and 

 these will, I think, convince any one of this ; but at present I must 

 confine myself to saying this much. On the north side of the town 

 the Purple Boulder-clay is overlaid by gravels, which are shown to 

 be of Glacial age by their contorted bedding, and by the way in which 

 they are jammed into and against the Boulder-clay. These crushed 

 and crumpled gravels occur where the cliff is low, extending about 

 as far as Sands Lane. North of this point the cliff rises at Potter 

 Hill and continues to rise towards Sewerby ; and along this part of 

 the cliff the Boulder-clay is overlaid by gravels evenly bedded, which 

 I call the Sewerby gravels. I shall not now discuss the question of 

 the relation of these to the previously mentioned gravels. I will 

 merely say that these Sewerby gravels, though as a rule evenly 

 bedded, do exhibit in some places near their base contortions and 



