THE 



GEOLOG^ICAL MAGAZINE. 



NEW SERIES. DECADE II. VOL. VIII. 



No. II.— FEBRUARY, 1881. 



OI^XG-II^^J^XJ J^I^TIGLES. 



i. — coxtributioxs to thk paleontology op the yorkshire 



Oolites.^ 



Part VI. 



By Wilfrid H. Hudleston, M.A., F.G.S., V.P.G.A. 



(PLATE III.) 



Genus Nerita, Lian^us, 1758. Subgenus Neritopsis, Grateloup, 



1832. 



There is no positive evidence that any species of Nerita has been 

 found in the Corallian Rocks of Yorkshire. It is true that Nerita 

 Icevigata, Sow., is quoted by Phillips (G. Y. 1875, p. 258), but this 

 fossil is well known to be a Monodonta, and it is doubtful if the 

 exact form occurs on this horizon (see postea, Turbo Erinus). The 

 same author also quotes "Nerita bullata'' as occurring in the 

 Coralline Oolite. I can find no reference to this species, and am at 

 a loss to understand what fossil is intended to be thus designated. 

 There are casts in the Coral Eag of North Grimston which may 

 belong to a species of Nerita. 



The subgenus Neritopsis is probably more thoroughly marine. 

 D'Orbignj'' (T. J, ii. p. 221) refers to twenty-three fossil species, and 

 regards the maximum of its development as having occurred in the 

 Corallian stage. It is, however, an important Tertiary group.^ 

 Specimens belonging to three species of Neritopsis have been found 

 sparingly in the Coral Eag of Yorkshire : of these iV^ Guerrei, Heb. and 

 DesL, has been noted before, and although not frequent is the least 

 rare of the three. 



36. Neritopsis Guerrei, Hebert & Deslongchamps, 1860. 

 Plate III. Figs, 'da, h, c. 



Neritopsis Guerrei, Hebert & Deslongchamps, 1860, Bull. Soc. Linn. Norm. vol. v. 

 p. 185, pi. i. figs. 4«!, b, c, d. 



Bibliography, etc. — The diagnosis of this Callovian species by the 

 authors is sufficiently loose, and the three specimens figured by 

 them embrace a considerable width of variation. The ornaments in 

 their fig. 4c have the most resemblance to our Corallian shell. 

 On the whole the resemblance is sufficiently near to justify the 

 identification in preference to making a new sj)ecies. The authors 



' Continued from the December, 1880, Number, p. 538. 

 2 Cf. Dr. Woodward, in Geol. Mag. for 1879, p. 545. 



DECADE II. — VOL. VIII. — NO. II. 4 



