Mr. Arrowsmith’s general Index to English Maps. 349 
Habitats of the first 184 species, above mentioned; making in all 
222 different Shells, whose places in Mr.Smith’sseries of the Strata, 
and their topographical situations, are ascertained in this volume. 
While this second volume of Mr. Sowerby’s Work has been in 
progress, Mr. Smith has published the first part of his ‘ Strati- 
graphical System,”’ (see P.M. vol. 50. p.271) describing or men- 
tioning 1155 specimens of Fossil Shells, Coralites, &c. found in 
the Strata which over-lie the Lias, at 263 different Places in 
England; and he has also published, three numbers of his 
“ Strata Identified,” containing figures of the most characteristic 
Shells, Coralites, &c. in the upper part of the British Series, 
over-lieing the Cornbrash Limestone: | have lately very carefully 
collated these four numbers of Mr. Smith’s Works, with the first 
37 numbers of * Mineral Conchology,” and thereby 1 have been 
sorry to find, that a good many errors, as to the Strata and the 
varieties of Shells, have crept into the Index of Places (that are 
mentioned in Mr. Sowerby’s Ist volume,) which is inserted in 
P.M. vol. xlvi. p. 211 to 224 ; several new Localities of the Shells 
- described in the Ist volume, have also been recorded in vol. 2d. 
In order to correct and supply these deficiencies, | have con- 
trived, to introduce all the most material of the corrections and 
additions, wanting in the former Index, into the Index of Places*, 
with their Strata and Shells, for which now I solicit insertion 
in your Work: nearly all of the remaining errors in the first 
Index may be corrected, aud the Greek Letters added to distin- 
guish the varieties of the Shells named, by means of, a List of the 
* I was in hopes, by some delay in setting about this Index, since Mr. 
Sowerby finished his 2nd Volme, that my labour in hunting through Maps 
for the situations of a large portion of the Places mentioned in his and Smith’s 
Works, might ere this have been greatly shortened, by a reference to the 
Manuscript Index which my valued Friend, the able and indefatigable Afr. 
Arrowsmith of Soho-square, has for near two years been preparing, and 
which is intended to contain, every Name, of Towns, Villages, Farms and 
Cottages, Mills, Mines, Collieries and Quarries, Rivers, Streams and Water- 
falls, Bays, Headlands, Cliffs and Lighthouses, Mountains, Hills and Valleys, 
Parks, Forests and Woods, &c. &c.; together with the District Names, &c. 
which are to be found, not only in his own large and unparalleled Map of 
England and WVales; but also, in all the largest County Maps, local Maps of 
Canals, Roads, Mining-Districts, &c. &c. which either his own large Col- 
lection contains, or to which he can have access, through the kindness of 
the friends of Science : unfortunately however for me, this great Index toLo- 
calities, although all the names from printed Maps were collected out (and 
ascertained by Bearings and Distances), and it is now rapidly proceeding 
towards its final revision and completion, it has not been in a state for me 
to consult it, as otherwise, the kindness and liberality of Mr. A. would have 
permitted, prior to its publication; which now will soon take place; with 
the addition, of the population, and a blank column, for future corrections 
and additions, and to enable this volume to be made, by Scientific, Curious, 
or Travelling Persons, into an universal Index to Localities in South Britain! 
Shells 
