THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE III. VOL. II. 



No. II.— FEBRUARY, 1885. 



CD^RXOrXlSTJ^Xj ^^IRTIOXiEiS. 



I. — Contributions to the Paleontology of the Yorkshire 



Oolites. 

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

 (Continued from Decade III. Vol. I. p. 303.) 

 (PLATE II.) 



67. — Neritopsis (? Turbo) levigata, Phillips, 1829. Plate IL 

 Figs. 1, 2, 3, 3a. 



1829 and 1835. Turbo Icevigatus (Nerita Icevigata, Min. Conch.). Phillips, G.T. 



p. 129, pi. xi. fig. 31. 

 1852 ? Turbo gibbosus, D'Orbigny. Terr. Jurass. ii. p. 342, pi. 330, fig. 1-3. 

 1854 ? Monodonta gihbosa, 'I'horent. Morr. Cat. p. 258. 

 1875. Turbo laivigatus, Phillips, G.Y. 3rd ed. p. 330, pi. xi. fig. 31. 



Bibliography, etc. — The type specimen of Turbo Icevigahis, Phil., 

 has not been seen by me ; but since there are some grounds for 

 regarding the fossil, usually so described, as a Neritopsis, the identi- 

 fication becomes important. We must therefore fall back upon 

 Phillips's figure, and upon such collateral evidence as, in the absence 

 of description, may be available. Phillips in the early editions of 

 the G.Y. considered Bean's specimen from the Dogger as identical 

 with Nerita Icevigata, Sow. (M. C. t. 217, fig. 1), which he regarded 

 as a Turbo rather than a Nerita. This identification of Phillips has 

 not been endorsed by subsequent writers. D'Orbigny believed 

 that he recognized in Turbo Icsvigatus, Phil,, Delpliinula gibbosa, 

 Thorent (Mem. S. G. Fr. 3, p. 260, pi. 22, fig. 10). D'Orbigny's 

 figure, making due allowance for enlargement, is very similar to the 

 one by Phillips. 



There are two points in which D'Orbigny's description of Turbo 

 gibbosus does not correspond with the Dogger fossils identified by 

 me with Turbo Icevigatus, Phil. (L) T. gibbosus is described by 

 D'Orbigny as having a smooth whorl. (2.) That author finds 

 traces of a tooth on the columella. Neither of these peculiarities 

 can be predicated of the Dogger fossils now under consideration. 

 Therefore, without actually seeing Thorent's type, its identification 

 with the shells I call Neritopsis Icevigata, Phil., is not absolutely 

 certain. At the same time, there are specimens from the Dogger, 

 such as Fig. 3 of our Plate, where the fine spiral ornamentation is so 

 obscure that, in another matrix, it might altogether escape observation. 



DECADE III, — VOL. II. — NO. II. 4 



