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- W1964156720 abstract "It is exceedingly difficult to fix the limits of the genera of many fossil Gasteropoda and to ascertain their affinities with those of existing forms. As the soft parts of the animals are never preserved, the only data upon which we can rely are such as may be derived from the form and structure of the shell. The most characteristic feature in the Murchisoniae is the slit in the outer lip, the successive filling-up of which gives rise to the formation of a band upon the whorls of the shell. Now this slit in the outer lip exists in several other genera, such as Pleurotomaria, Pleurotoma , some species of Turritella, Siliquaria, Scissurella, Emarginula, Bellerophon , and, to a greater or less degree, also in Haliotis, Ianthina, Euomphalus , c in both genera the slit is represented on the whorls by a well-defined band, and the only external difference between the shells is the form of the spire, that of Murchisonia being elongated, while in Pleurotomaria it is short. But there are shells of every intermediate length, and these have been referred sometimes to the one genus, and sometimes to the other. G. Lindstrom (‘Silurian Gasteropoda and Pteropoda of Got land,‘ p. 92*) thinks it well to limit the genus Murehisonia to shells which have a long slender spire of more" @default.
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- W1964156720 date "1887-02-01" @default.
- W1964156720 modified "2023-09-30" @default.
- W1964156720 title "Notes upon some Carboniferous Species of <i>Murchisonia</i> in our Public Museums" @default.
- W1964156720 doi "https://doi.org/10.1144/gsl.jgs.1887.043.01-04.46" @default.
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