LXX. An alphatetical Arrangement of the Piaces from 
whence Fossi. SHELLS have been obtained by Mr. James 
Sowrrsy, and drawn and described in Volume Ill. of his 
“ Mineral Conchology,” with the geographical and strati- 
graphical Situations of those Places, and the Species of Fossil 
Shells, Gc. By Mr. Joun Farry, Mineral Surveyor. 
To Dr. Tilloch, 
Sir, — ie your 46th volume, p. 211, and in your 52d volume, 
p- 55 are inserted, alphabetical Lists of the Places, mentioned 
as localities of the Fossil Shells figured and described by Mr. 
Sowerby, in the two first volumes of his ‘© Mineral Conchology;” 
and his third volume having now been completed, I beg the fa- 
vour of you to insert, a similar List of the Localities in this third 
* volume: in which volume, 45 Genera, embracing 195 species or 
varieties of Shells, are described belonging, each to some one 
particular Stratum ; and besides these, 19 other species or vari- 
eties* belonging to some other Stratum, and which Species are 
on that account distinguished, by adding the Greek Letters , 
y or 6, for the purposes of stratigraphical discrimination. 
I feel a satisfaction in observing, that almost every succeeding 
Number of Mr. Sowerby’s Work (which now appear Monthly), 
contains increasing evidence, in favour of those Principles re- 
garding Fossil Shells and their connexion with the Strata, which 
I am somewhat proud of having developed and given to the world, 
in your 53d volume, p. 115, and in others of your pages. 
My stratigraphical Index to Mr. Sowerby’s 3d volume, has 
been sent to him for publication, corresponding to the List now 
sent to you: I beg to request of your Geological Readers to ex- 
amine these, and to send corrections of the same to you, to Mr. 
Sowerby or myself, wherever they may be able to detect errors 
therein, truth alone being my aim. 
In the List now sent, several errors recently discovered in the 
former Lists inserted in your Work, will be found corrected; 
but some others yet remain, in the List in vol. 52, which it may 
be proper to correct, as follows, viz,: p.353, 1. 9, for Blue 
Lias read Portland Rock: p. 355, 1. 10 and 11, for Portland 
Rock read Coral Rag, and 1, 22, for W read E: p. 356, 1.2, 
* Thee of these are already included in the List in vol. 53, p. 120, and 
the othér 16 are as follows, viz. Ammonites annulatus 2 Species, A. 
Bechei 2, A. Koenigi 2, Avicula echinata 2, A. inequivalvis 3, Cardita 
margaritacea 2, Conularia quadrisulcata 2, Hippopodium ponderosum 2, 
Inoceramus sulcatus 2, Lutraria ovalis 2, Mya? literata2, M. V-scripta 3, 
Terebellum fusiforme 2, and Terebratula inconstans 2 Species: at a future 
time I intend to particularize these, in the manner of the List in vol. 53. 
Vol.59, No, 289, May 1822, Ss for 
