Corresjjondence—J. Wilfrid Jackson. 835 



Explanatory Guide to the Relief Map of the Geology of the 

 Bristol District. By Professor S. H. Reynolds, M.A., 

 Sc.D. Bristol Museum and Art Gallery, Publication 19. pp. 19, 

 1921. Price 3cl. 



T\7E are glad to learn that tlie Bristol Museum has now acquired 

 ' ' a model, on the scale of 3 inches to one mile, showing the 

 topography and geology of the district. The Bristol area has long 

 been known as one of exceptional interest, and this model, together 

 with the lucid account of the physical and geological history of the 

 region contained in this pamphlet, cannot fail to be of great value 

 to geologists, whether possessing local knowledge or not. The 

 Curator of the Museum, Mr. H. Bolton, is to be congratulated on 

 the enterprise that led to this happy undertaking. May this example 

 encourage all other local museums to do likewise. 



CORRESPONDENCE. 



DAVIESIELLA LLANGOLLENSIS (DAV.) IN DERBYSHIRE. 



Sir, — I have recently had the good fortune to find typical 

 examples of Daviesiella llangollensis, near Topley Pike, between 

 Millers Dale and Buxton, almost in the middle of the typical east 

 and west section described by Dr. Sibly in 1908 {Q.J.G.S., vol. Ixiv). 

 This occurrence and the associated fauna, together with the lithology 

 of the beds, suggest that the upper part of Horizon 8 (Cg-Si) is 

 present here, and in a forthcoming paper I am dealing with this 

 important fact. In the same paper I am also adducing evidence in 

 favoar of a much earlier age for the famous " Brachiopod Beds " of 

 the Midland area, and suggesting the possibility of a marked hiatus 

 between the massive limestone including the " Brachiopod Beds " 

 and the overlying shale-series, in certain parts. 



J. Wilfrid Jackson. 



Manchester Museum. 

 20th May, 1922. 



DINOCOCELEA. 



Sir, — It seems almost ungracious to point out an omission in 

 Mr. B. B. Woodward's admirable paper on the molluscan monster 

 from Hastings ; but would he be kind enough to give the derivation 

 of his new generic name ? There are two alternatives consistent 

 with correct etymology and the nature of the fossil, and experience 

 has taught me how unsafe it is to assume that one of them is more 

 likely than the other to have been in an author's mind. 



To pass from the particular to the general : A museum curator 

 soon learns how curious the public is to know the meaning of names, 

 a meaning often far from clear even (or, sometimes, especially) to 

 the classical scholar. The systematist also recognizes that much 



