378 Bibliographical Notices. 
amongst Podure. The Linnean species is, no doubt, a true 
Podura, probably an Anura, which also agrees with the habits 
of life which he ascribes to his species. Schrank’s “ Gehender 
Springschwanz”’ may be a Campodea, though now it would be 
impossible to say which; but in adducing as a synonymous 
name Podura ambulans, L., Schrank committed a mistake, which, 
of course, ought not to be imitated. 
Campodea fragilis is frequent in the neighbourhood of Copen- 
hagen, in moist black earth ; under stones it is often seen in 
troops, which quickly disperse when the light is let in upon 
them. It lives, at least partly, on dead insects, as I have often 
found in its stomach scales of butterflies and other remains of 
insects which it could not have attacked or overcome alive. 
BIBLIOGRAPHICAL NOTICES. 
British Conchology. Vol. 1V. Marine Shells, in continuation of 
the Gastropoda as far as the Bulla Family. By Joun Gwyn 
JEFFREYS, F.R.S., F.G.S., &c. Van Voorst, 1867. 
Tus is by far the most valuable volume of Mr. Jeffreys’s work yet 
published. It contains descriptions of the most interesting and at 
the same time the most difficult families of Marine Gastropoda, in- 
cluding certain genera which the author has made peculiarly his own, 
and on which he is more competent than any other conchologist to 
treat; and there is not wanting evidence in this and in preceding 
volumes of the great advantage which the possession of immense 
series of specimens collected from all parts of the coast, for ex- 
amination and comparison, gives him in the preparation of his work. 
Our first impulse was to turn to the genus Odostomia, in the hope 
of finding that the extreme and wholly insurmountable difficulty 
which every student of Forbes and Hanley has found in the diseri- 
mination of the members of that genus might be in some degree 
removed by a wholesome reduction in the number of so-called specific 
forms. It is satisfactory to find that this is the case. Warrenii is 
united with obliqua; alba, dubia, nitida, and glabrata take their 
place as varieties of rissoides ; rufescens is joined with scalaris ; 
Sulvocincta with rufa ; formosa is expunged altogether, as not being 
British ; and affinis is regarded as a variety of acicula, as is also the 
form described a few years ago in the ‘ Annals’ by the author under 
the name Hulimella obeliscus. With one exception, on which some 
doubt may be entertained, we fully concur in the justice of these eli- 
sions, and believe, moreover, that future observation will result in the 
process being carried yet a little further. It will be observed that 
Chemnitzie and Eulimelle have here been spoken of as Odostomie, 
the fact being that Mr. Jeffreys has discarded the former genera and 
grouped the species in Odostomia. Now it is true that there are’ 
certain osculant forms which create difficulties in the definition of 
