344 GASTEROPODA OF THE INFERIOR OOLITE. 



278. Neritopsis, cf. sulcosa, d'Archiac, 1843. Plate XXVIII, fig. 4. 



1843. ? Neeita sulcosa, d'Archiac. Mem. Soc. Geol. France, vol. v, pt. 2, p. 377, 



pi. xxviii, fig. 10. 



1851. Neritopsis sulcosa, d'Archiac. Morris and Lycett, Great Ool. Moll., 



pt. 1, p. 59, pi. xi, fig. 12. 



1884. — — — Cossmann, Et. Bath. (Mem. Soc. Geol. 



France), p. 159, pi. iii, figs. 15—17. 



i 



Attention is called to a specimen from the Nerinaea-bed in the Pea-grit of 

 Orickley, which has considerable resemblance to this Bathonian species. The 

 Inferior Oolite specimen is somewhat squeezed out of shape, but the ornamentation 

 is similar to that of N. sulcosa. It might also be regarded as a modified form of 

 the fine variety of Neritopsis PJiilea. 



279. " Neritopsis l^vigata." Plate XXVIII, fig. 10. 



1885. Neritopsis (? Turbo) l/evigata, Phil., pars. Hudleston, Geol. Mag., 



dec. 3, vol. ii, p. 49, pi. ii, fig. 2. 

 Non figs. 1, 3, 3 a. 



Since the Dogger shell, represented in the accompanying plate, was originally 

 figured, evidence has been obtained which renders it probable that this form should 

 be separated entirely from Turbo Icevigatus, Phil. 



A very similar and possibly identical form occurs at Duston in the North- 

 ampton Sand. These shells are transversely ovate, globose, and thick, averaging 

 22 mm. in height and 26 mm. in width. The very small spire consists of from 

 two to three smooth and rounded whorls, the whole shell suddenly expanding into 

 an enormous body-whorl, the sutures being rather close. The posterior area of 

 the body-whorl is subtabulate, the sides ventricose, and the ornaments consist of 

 fine spiral striae decussated by growth-lines. Aperture large and semilunar ; 

 character of the inner lip uncertain. 



It cannot be affirmed with certainty that this species really is a Neritopsis. The 

 Duston shells seem related to a very large form of Natica or Ampullina, which occurs 

 in the Lincolnshire Limestone, and which I have hitherto considered as being 

 identical with Natica cincta (Leckhamptonensis). On the whole, " Neritopsis 

 levigata " cannot be regarded as an established species. 



