THE 



GEOLOaiGAL MAGAZINE. 



NEW SERIES. DECADE II. VOL. VIII. 



No. I.— JANUARY, 1881. 



os-ia-iisr^^ij .a.:rtigIjIiis. 



I. — On Genera, and Species . of Spiral-Bearing Brachiopoda, 

 FROM Specimens Developed by the Eev. Norman Glass : with 

 Notes on the Eesults obtained by Mr. George Maw from 

 Extensive Washings of the Wenlock and Ludlow Shales 

 OF Shropshire. 



By Thomas Davidson, F.R.S., P.G.S., etc. 



AS some fifteen months must unavoidably elapse previous to the 

 publication of the Silurian Supplement to my work on the 

 British Fossil Brachiopoda, it has been considered desirable to an- 

 ticipate a part of its contents, relating to the recent discoveries of 

 the Eev. Norman Glass, of Manchester, as to the spirals and their 

 connecting processes and attachments in the Brachiopoda of the 

 Upper Silurian rocks. 



The researches of Mr. Glass, referred to in this paper, but more 

 fully to be detailed in the forthcoming Silurian Supplement, have 

 been long and arduous, and the important and interesting results 

 attained are only commensurate with the skill and perseverance 

 which he has so abundantly shown. I feel greatly indebted to him 

 for his prolonged and valuable assistance. The first difficulty 

 besetting Mr. Glass in his operations was the finding of suitable 

 specimens — hundreds of examples of a particular species being 

 sometimes needed to produce the desired result. This difficulty has 

 been overcome through the willing services of George Maw, Esq., 

 E.L.S., E.G.S., of Benthall Hall, Shropshire, and my cordial thanks 

 are due to him for the most generous manner in which he has had 

 so many tons weight of the Wenlock Shale washed, and the old 

 quarries of Benthall Edge carefully hand-picked, for specimens. 

 Indeed, without the thousands of specimens thus jDrocured, many of 

 Mr. Glass's discoveries might never have seen the light. Other 

 valuable results of the intelligent and indefatigable help which 

 has been rendered to me by Mr. Maw will be shown in the 

 stratigraphical sections and lists at the close of this paper. It 

 should be added also that in sorting the specimens needed for the 

 preparation of the stratigraphical lists and in many important 

 suggestions, I have been greatly aided by the Eev. H. G. Day, of 

 Brighton, and I desire gratefully to acknowledge his devoted assist- 

 ance, rendered all the more trying and difficult from the minuteness 

 of many of the shells. 



It may be well to mention here that Professor James Hall and 



DECADE II. — VOL. VIII.— NO. I. 1 



