238 Correspondence— G. L. Elks— J. Wright. 



the microscope ai'e found to be biaxial. — On Diindasite from North 

 Wales : by G. T. Prior. The mineral was found by Mr. H. F. 

 Collins in the Welsh Foxdale mine, Trefriw, Carnarvonshire ; it 

 occurs in white silky radiating tufts on cerussite with allophane ; 

 analysis showed it to be identical with dundasite, hitherto known 

 only from Dundas. Tasmania. A probable formula is Pb . Al, O3 . 

 2 CO2 . 4 H2 or Pb H2 (003)2 . AI2 . Hg . 



GOI^I^:E3s:poIT3D■SI^^CE!. 



GEAPTOLITE ZONES IN THE ARENIG EOCKS OF WALES. 



Sir, — It has been brought to my notice that in my paper on 

 " Graptolite Zones in the Arenig Rocks of Wales," I have omitted 

 a reference to a paper by tlie late Mr. T. Eoberts, which was 

 published in 1893, Quart. Journ. Geol. Soc, p. 166. I hope I made 

 it clear that I fully recognised the value of Mr. Roberts' work, but 

 I regret the unintentional oversight. 



Gertrude L. Elles. 



Sedgavick Museum, Cambridge. 



LOWER GREENSAND FORAMINIFERA FROM LITTLE COXWELL, 

 NEAR FARINGDON. 



Sir, — A book entitled "The Neocomien Sponges, Bryozoa, 

 Foraminifera, and other fossils of the Sponge-gravel Beds of Little 

 Coxwell, near Faringdon," by E. 0. Davey, has just been published. 

 It gives much new and interesting information regarding the fossils 

 of the deposit. It was only of recent years, however, that the 

 author became aware of Foraminifera occurring in the gravels ; the 

 credit of this discovery, he tells us. is solely due to Mr. F. Mockler, 

 of the Holburn Museum, Bath. The Foraminifera were sent to me 

 to be named. They consisted of a large number of specimens 

 belonging to 53 different species, some of them being rare and 

 intei'esting forms, and all or nearly all of them being now recorded 

 from the place for the first time. It is, however, to be regretted 

 that the proof was not sent to me for correction ; the list is valuable, 

 but as it is now printed contains a number of errors as regards the 

 Foraminifera, and as it would be most desirable that it should be 

 accurately given to be of use to others, I would be much obliged if 

 you would kindly publish in the Geological Magazine the corrected 

 list which I now enclose. 



Foraminifera. 

 c. = common. v.c. = very common. r. = rare. v.r. = very rare. 



■Cornuspira eretacea, Rss. v.r. Ammodiscits gordialis, J. & P. v.r. 



Tlacopsilina ce>ioma)ia,d'' Orh. Specimens Gaudri/ina o.v!/co>ia, 'Rss. v.c. 



large. Frequent. Hitlimina pupoides, A^Ovh. v.r. 



Saplostiche Soldanii {J. kV.). v.r. £olirina tcff/data, Rss. One specimen. 



Thuramminopsis canaliculata, Haensler. Lagena globosa (Montagu), v.r. 



v.r. JVodosaria {Gl.) ccqualis, Rss. v.r. 



•Cyclammina cancellata, Brady, c. N. cahmorpha, Rss. One specimen. 



