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POPULAR SCIENCE REVIEW. 
author, may "be mentioned the fact, pointed out first by Professor Gulliver, 
that in one species the cells are considerably larger than the other, a point 
which even a good Coddington lens enables one readily to discover. The 
statement that the Sea-spleenwort is only to be found on the south-west 
coast (England), must be accepted with some qualification. We have found 
it in great abundance in various parts of the south-east of Ireland. The 
illustrations to Mr. Cooke’s book are divided between the plates and the 
text, and are carefully executed. 
BRITISH CONCHQLOGY.* 
I N this the fourth volume of his British Conchology, Mr. Jeffreys continues 
his description of the Marine Gastropoda, commencing it with the genus 
Rissoa, and bringing it down to the genus Bulla. Of the general plan of the 
work we have spoken in our notice of the earlier volumes ; we need only say, 
therefore, that in the present instance the general scheme has been carried 
out fully and faithfully. The genera described are in all cases as comprehen- 
sively treated as the most earnest conchologist can desire, and the accessory 
details are such as are not always to be found in systematic works on the 
mollusca, unless indeed in the splendid treatise of Forbes and Hanley. The 
plates in the volume now issued are nine in number ; the first one, which 
forms a frontispiece, being an exquisite, coloured representation of the 
singular Ianthina, and the remaining eight being carefully-drawn sketches W 
Sowerby, of the genera referred to in the text. The table of geographical 
distinctions shows the different areas of the recent and fossil gastropods, and 
is valuable for purposes of reference. As a specimen of how the author deals 
with a genus, we should wish our readers to take up his description of 
Ianthina ; this, which relates to all points in the natural history of this singu- 
lar creature, extends over nearly fifteen pages, and is a miniature monograph 
literally crammed with facts; so well has the author condensed his observa- 
tions. The fifth volume will complete the work, and will contain an account 
of the remaining Pleurobranches, the Nudibranches (by Mr. Alder), the 
marine Pulmonobranches, the Pteropods, and the Cephalopods. It will also 
include a supplement and a series of plates, plain and coloured, depicting 
all the species and remarkable varieties of British shells. When completed, 
the work will be the most complete and compact treatise in our language. 
GOLDING BIRD’S NATURAL PHILOSOPHY, f 
T HE old friend of our student days, our companion in the lecture-room and 
the physical laboratory, is about to undergo a change of name, in fact, has 
* “ British Conchology ; or," an Account of the Mullusca which now in- 
habit the British Isles and the surrounding Seas.” Vol. IV. Marine Shells. 
By J. Gwyn Jeffreys, F.R.S., F.G.S. London: Van Voorst. 1867. 
t “The Elements of Natural Philosophy; or an Introduction to the Study 
of the Physical Sciences.” By Charles Brooke, M. A,. F.R.S. Based on the 
