82 ALBIAN FOSSILS DISCOVERED AT OKEFORD FITXPAIXK. 



RANGE OP SPECIES. Albian. 



LOCALITIES. Folkestone, Ridge (S.E. of Chilmark) ; Wissant, 

 d'Ervy, Macheromenil, Varennes, &c. 



NATICA GAULTINA, Orbigny. 

 PI. iii., fig. 6. 



Ampullaria canaliculate/,, Mantell : Geology of Sussex, 1822, 

 PI. 19, fig. 13, p. 87. non Lamarck, 1804. 



Natica canaliculata, J. de C. Sowerby : Trans. Geol. Soc., 

 London, 1836, Ser. 2, Vol. 4, PI. 11, fig. 12, and PI. 18, fig. 6, 

 p. 336. non Deshayes, 1832. 



Natica Gaultina, Orbigny : Paleontologie Frangaise, Terrains 

 Cretans, Gasteropoda, 1842, PL 173, figs. 3-4, p. 156. 



Helix Woodwardi, Alfred Bell : Geological Magazine, 1875, p. 240. 



Two specimens of tins species were found at Okeford Fitzpaine, 

 and, although somewhat crushed, they retain their characteristic 

 features. The shell is of greater width than height, very inflated, 

 and marked by prominent lines of growth ; the spire is composed 

 of convex whorls divided by a canaliculated suture ; the aperture 

 is oval ; umbilicus large, circular, gradually expanding into the 

 base, and without a callosity. 



Dimensions Length = 20") _ , 



} Millimetres. 

 Breadth = 25/ 



Thinking that he had discovered a terrestrial mollusc in the 

 Folkestone Gault, Mr. Alfred Bell named and described a specimen 

 as Helix Woodicardi ; but the most cursory examination of this 

 type, now in the British Museum, clearly proves the determination 

 was erroneous, the shell undoubtedly representing a rather de- 

 pressed form of Natica Gaultina. D'Orbigny first pointed out 

 that Mantell's original name for this shell had already been 

 occupied by Lamarck for another form ; therefore a change in 

 nomenclature was needed, and N. Gaultina was adopted. This 

 author, however, did not allude to the fact that N. canaliculata of 

 Sowerby, 1836, would have been available had it not been that 

 Deshayes monopolised it for an Eocene shell in 1832. 



