378 Bibliographical Notices. 



amongst Podurse. The Linneean 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 Canqjodea, though now it would be 

 iujpossible to say which; but in adducing as a synonymous 

 name Fodura ambulans, L., Schrank committed a mistake, which, 

 of course, ought not to be imitated. 



Campodeafragilis 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. Murine 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, 18G7. 



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 diffici\lt 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 ditficulty 

 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 oi//y?m ; alba, dubia, nitida, and glabrata take their 

 place as varieties of rissoides ; rvfescens is joined with scalains ; 

 fvlvocincta with rvfu ; 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 

 tlie 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 

 ChemnitzicB and Eulimellce have here been spoken of as OdostondcB, 

 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 diflSculties in the definition of 



