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Published online by Cambridge University Press: 01 May 2009
The Gasteropoda, next to the Lamellibranchiate Mollusca, are the most varied class of organisms found in the Lias. The general elegance of their forms, and the frequent beauty of their ornamentation, make these fossils extremely attractive objects; whilst their limited vertical range gives them a by no means inconsiderable stratigraphical importance. Notwithstanding these inducements to their study, the Gasteropoda of the Lias have not received, in this country, anything like the amount of attention which has been given to the other leading classes of organisms derived from that formation. On the Continent, on the other hand, considerable progress had been made in the investigation of this interesting group of fossil mollusca more than thirty years ago.
page 193 note 1 In the Lias of Luxembourg and Hettange, several Gasteropods have been found, which are not only perfect in form, but even retain the original colours and markings of the shells. (See Terquem, , “ Paléontologie de Hettange,” Mem. Soc. Geol. France, 2nd ser. vol. v. pp. 219–343, pl. xii.-xxvi.)Google Scholar
page 194 note 1 See Quart. Journ. Geol. Soc. vol. xxiii. p. 449, pl. 14–16Google Scholar; Proc. Somerset Arch, and Nat. Hist. Soc. vol. xiii. p. 119, pi. 4–6. It is unfortunate that these types should have been so indifferently delineated. Moore's sketchy figures give hut a poor idea of the beauty of these fossils, and, in several instances, are so inaccurate as to be positively misleading as to their form. Students of this group should therefore beware of too readily trusting to identifications founded solely on comparisons of their specimens with these figures.Google Scholar
page 194 note 2 This number is certainly capable of increase.
page 199 note 1 The matter is complicated by D'Orhigny describing; a typical Trochus duplicatus, Sow., in another part of the Pal. Franc. (Terr. Jur. Gast. ii. p. 275, pi. 313, figs. 5–8) under that name.