88 | Reviews—Hudleston and Wilson’s Jurassic Gasteropoda. 
REV ws. 
J.— A Caratocure or British Jurassic Gasteropopa. By W. 
H. Hupusston, M.A., F.R.S., Pres.G.S., and Epwarp WILson, 
F.G.S.  8vo. pp. xxxiii. and 147. (London: Printed for and 
Published by the Authors, and Dulau & Co., 1892.) Price 7s. 6d. 
CONSIDERATION of the mass of Geological literature shows 
every year the greater need, not merely of indexing our 
knowledge but of tabulating the facts that have been accumulated. 
The mere catalogue of publications is valuable in its way to scientific 
workers, if brought out at regular intervals; but far more valuable 
are those works which, like the present one, summarize our 
knowledge on particular subjects. 
The labour of cataloguing our British Fossils was for lone 
in abeyance, until happily a start was made in the excellent 
Catalogue of British Fossil Vertebrata, by Messrs. Smith Woodward 
and Sherborn. We have much pleasure now in announcing the 
publication of another work that enumerates one group of British 
fossils—the Gasteropoda of the Jurassic rocks. This work, like the 
one before mentioned, is not a simple list of the known species, but 
a careful record of the well-established species, with full references 
to the original figures and authorities, and to the geological forma- 
tions and principal localities. The nomenclature has been subject 
to critical revision, and all synonyms, as well as names of rejected 
and doubtful species, are noted in an appropriate manner. Such a 
work can only be adequately done by those having special know- 
ledge ; and in the present instance the work has been undertaken 
and accomplished by the highest authorities. Thus Mr. Hudleston 
has for many years made a particular study of the Gasteropoda of 
the Oolitic rocks, and the results of his labours have been published 
partly in this Macazing, and partly in the volumes of the Palzonto- 
graphical Society; while Mr. Wilson has devoted himself more. 
especially to the Liassic Gasteropoda, and his contributions on the 
subject are well known to readers of the GroLogicaL MaGazinr. 
In their present work, the authors enumerate, in one list, all 
species from the Lower Lias to the Portland Beds; and they give 
a separate list of the Rhetic species, which “though not strictly 
Jurassic,” are included, so as to indicate the scanty beginnings of 
the Jurassic Gasteropod fauna. These are supplemented by lists of 
Foreign species of doubtful occurrence in British strata, and of 
“species” not accepted. It will be noticed that the Purbeck 
Gasteropods are omitted, and we judge that this is due to the fact, 
that at present the species have not been fully worked out. More- 
over the authors remark that, ‘The identification in British Jurassic 
rocks (below the Purbecks) of terrestrial and freshwater Gasteropoda, 
in beds associated with marine bivalve and other fossils, cannot be 
unreservedly accepted without some strong confirmatory evidence.” 
The species of Helix, Hydrobia, Planorbis, ete, that have been 
described are inserted with a query. 
