378 Bibliographical Notices* amongst Podurse. The Linnsean 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., 8chrank 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. IV. Marine Shells, in continuation of the Gastropoda as far as the Bulla Family. By John Gwyn Jeffreys, F.R.S., F.G.S., &c. Van Voorst, 1867. This 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 discri-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 ohliqua ; alba, dubia, nitida, and glabrata take their place as varieties of rissoides ; rufescens is joined with scalaris ; fulvocincta with r-vfa ; 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 Eulimella 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 Chemnitzice and Eulimellce have here been spoken of as Odostomia, 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
British Conchology. Vol. IV. Marine Shells, in continuation of the Gastropoda as far as the Bulla Family. By John Gwyn Jeffreys, F.R.S., F.G.S., &. Van Voorst, 1867
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