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| Keywords: The Quarterly journal of the Geological Society of London (13364960285).jpg 1849 <br> SHARPE ON THE GENUS NERIN A <br> 103 <br> only as the perforation of the columella is not accompanied by any <br> other constant character and the umbilicated and non-umbilicated <br> species can hardly be distinguished ; moreover N Voltzii of Des- <br> longchamps has the columella solid when young and perforated in <br> its older stages More than half the known species of Nerincea fall <br> into this division <br> Fig 1 is the section of a portion of i\ Archimedis D'Orb from <br> near Cintra which illustrates the internal characters of this sub- <br> genus <br> Fig 2 <br> Fig 1 <br> Subgenus 2 Nerinella <br> Columella solid either simple or furnished with one fold; the <br> outer lip with one internal fold ; folds simple ; the mouth usually <br> much longer than wide ; the shell nearly cylindrical or very taper <br> The species of this section are not numerous ; they have not the <br> characters laid down by the founders of the genus but are obviously <br> closely related to it they are usually small and very elongated <br> Fig 2 represents a section of part of iV Dupiniana D'Orb copied <br> from the Paleontologie Fran9aise ' to illustrate this subgenus <br> Subgenus 3 Trochalia <br> Columella umbilicated with one fold ; mouth rhomboidal ; the <br> outer lip either simple or thickened internally or furnished with <br> one internal fold ; folds simple ; the shell usually short and co- <br> nical <br> These species differ widely from the original type of the genus <br> and approach the Trochi ; they are usually of large size without any <br> Named fi'om its resemblance to Trochus <br> TpoxaXia a water-wheel <br> I 2 36933924 113689 51125 Page 103 Text v 6 http //www biodiversitylibrary org/page/36933924 1850 Geological Society of London NameFound Columella NameConfirmed Columella EOLID 58066 NameBankID 2687781 NameFound Nerinella NameConfirmed Nerinella NameBankID 4257365 NameFound Trochalia NameConfirmed Trochalia NameBankID 4378451 NameFound Trochus NameConfirmed Trochus EOLID 75224 NameBankID 4935234 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 6 1850 Geology Periodicals Smithsonian Libraries bhl page 36933924 dc identifier http //biodiversitylibrary org/page/36933924 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-23 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13364960285 2015-08-26 11 54 54 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1850 Photos uploaded from Flickr by Fæ using a script | ||||
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