366 Reviews—British Museum Catalogues— 
have been given even more fully with figures in this Macazine for 
December, 1888, by Dr. Gustav Lindstrém (p. 582), and subsequently 
in March last by Mr. A. H. Foord (p. 121).—Introduction, pp. xvii 
and xviii. 
Besides giving a “Table of the Nautiloidea,” prepared with a 
view to show the groups into which the species described by the 
author have been subdivided, Mr. Foord has also provided an 
excellent quarto table of the classification of the Lower Paleozoic 
rocks of Europe and North America, giving as nearly as possible 
the corresponding horizons for Britain, Scandinavia, Russia, Bohemia, 
France, and North America. This in itself forms a most valuable 
boon to the scientific worker, and will prove highly acceptable for 
_ other groups besides the Cephalopoda. 
We are greatly indebted to Mr. Foord for this his first instalment 
of a Catalogue of the Fossil Cephalopoda in the British Museum, and 
we trust he will not rest until he has completed this great work, and 
we, for our part, will continue to pray for its speedy delivery by 
Messrs. Taylor and Francis, equally well executed in its entire form 
as is the volume now before us. 
IJ.—CaraLocue or tHE Fossiz Fisnes in THE Britise Musrum 
(NaturaL History). Parr J. conraining tHe Hxasmo- 
BRANCHII. By ArtHuR SmirH Woopwarp, F.G.S., F.Z.S. 
8vo. pp. xlvil. and 474, with 17 Plates and 15 Woodcuts. 
(London, Trtibner & Co., Printed by order of the Trustees.) 
NDER the above modest title we are presented with an 
important systematic and descriptive work on the Taxo- 
nomical bearing and position of the extinct Hlasmobranch Fishes, 
and their relation to existing members of the group. 
The fossil forms are numerous, and range in geological time from 
the deposition of the Lower Carboniferous rocks—and even earlier, 
assuming that certain spines, from Devonian and Silurian deposits, 
really belong to Elasmobranch fishes—and through all subsequent 
geological periods into the later Tertiaries. The geographical range 
is also co-extensive with that of the other subclasses of extinct 
fishes. 
The fossil remains, with few exceptions, and these mostly of 
recent acquisition, consist mainly of unconnected portions of cartil- 
age, vertebra, bony spines (Ichthyodorulites), and teeth. This dis- 
association of important parts greatly puzzled the earlier naturalists 
in their efforts to determine the nature and connection of these 
fragments with each other; and also in realizing the near affinity 
of some of the extinct forms to existing genera. But the researches 
of later investigators, with far greater facilities for comparison 
and intercommunication, combined with the discovery in some 
localities of specimens more or less completely preserved, have 
minimized many of the difficulties encountered by the pioneers of 
the science. But, notwithstanding these advantages, the modern 
exponent still has his difficulties, as he must very often base his 
conclusions with regard to the genus, species, or the affinity of a 
fossil fish upon a mere fragment of its organism. 
