574 Correspondence — R. M. Br y done. 



has so adniii'ably worked out and described in his notes (loc. cit., 

 pp. 399-413). 



Mr. Collins has made a good beginning by finding a useful fauna 

 in a difficult area ; and by carefully recording the location of the 

 specimens he bas laid the foundations of a more detailed knowledge of 

 these rocks in the only possible way. He wisely commits himself to 

 no conclusions at present. When he has done more work on the same 

 lines, with the assistance of his palseontological friends, he may be 

 able to throw some light on the detailed stratigraphy of the area; 

 even if he does not, he will at least have given us something firmer to 

 build upon than those lithological resemblances on which Mr. Arber 

 has to place so much reliance. 



C. Davies Sherborn. 



J. Allen Howe. 



THE ZONAL CLASSIFICATION OF THE TEIMLNGHAM CHALK. 



Sir, — In his Presidential address this year to the Malacological 

 Society Mr. R. B. Newton quoted my statement in 1908 that " hence 

 the zone of Chalk at Trimingham, lying above the zone of Belemnitella 

 mucronata, now divided and defined by me for the first time, requires 

 a name ", and inferred from those words that I had forgotten my own 

 proposal in 1906 to establish a zone of Terebratulina gracilis and 

 T. Gisei for this Chalk. This is a misconstruction, but one to which 

 I have laid mj'self fairly open by excessive brevity. The facts are 

 that in the original paper of 1908 I stated that my opinion was 

 unaltered (it still is unaltered) that T. gracilis and T. Gisei were far 

 superior to any other fossil or assemblage of fossils both for defining 

 the zone and for labelling it. My editor said, " You had better leave 

 that out : they will never adopt it," and the statement quoted by 

 Mr. Newton was settled to take its place. It was intended to bear 

 the construction that two opposite views as to the best definition and 

 label of a zone embracing the Chalk of Trimingham being on record, 

 with a detailed account of the palaeontology of the numerous divisions 

 of that Chalk, the question is ripe for the final tribunal on such 

 questions, i.e. the consensus of textbook- writers, to which it must be 

 left. It does not follow that either view will succeed. 



E. M. Brydone. 



November 18, 1911. 



OBITUARY. 



Deaths are announced, on September 25 of Auguste Michel-Levy, 

 Director of the Geological Survey of France ; on August 6 of 

 Dr. Florentino Ameghino. Director of the Museum at Buenos Aires; 

 and on June 5 of Dr. Victor Carl Uhlig, Professor of Geology in the 

 University of Vienna. Suitable Notices will appear later on. 



