THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE III. VOL. I. 



No. II.— FEBRUARY, 1884. 



0:RX(3rXlSr^^Xj -i^E-TIOLIES. 



I. — Contributions to the Paleontology of the Yorkshire 



Oolites. 



Ey Wilfrid H. Hudleston, M.A., F.G.S. 



(Continued from Dec. II. Vol. IX. p. 251.) 



(PLATE III.) 



No. 2. Gasteropoda of the Oxfordian and Loiver Oolites. 



21. — " Phasianella " striata, Sowerby, 1814. 



1814. Melania striata, Sowerby, Min. Conch, p. 101, pi. 47. 



1850. Phasianella striata, Sowerby, Mon-. and Lye. Gt. Ool. MoU. p. 118, pi. xv. 



fig. 19. 

 ? 1858. Phasianella Scemaiini, Oppel, Juraformation, pp. 387. 

 1869. Bourguetia striata, Sowerby, Terq. and Jourdy, Bath. Mos. p. 51, pi. ii. 



figs. 21, 22, 23. 



THE subject of the identity of the great shell (or rather cast), 

 which occurs in the Scarborough Limestone, with the Corallian 

 P. striata, was partly discussed in the " Corallian Gasteropoda." ^ 

 Tlie considerable abundance of this form on certain horizons in the 

 Oolites, both of the north and south of England, and its complete 

 absence from other horizons, has attracted considerable attention. 

 Thus it appears alike in the Humphresianus-zone of Scarborough and 

 of Cheltenham, but not, as far as I know, in lower beds. The 

 Yorkshire specimens are not good enough to warrant any conclusions 

 as to the specific difference between this and the Corallian forms ; 

 therefore it seems safer to follow the authors of the Great Oolite 

 Mollusca in referring the White Nab fossils to Sowerby's species. 

 Moreover, I have less doubt as to the pi-opriety of this course after 

 reading the very interesting remarks of MM. Terquem and Jourdy 

 with reference to Bourguetia striata. 



These authors, perceiving, like M. Deshayes, the objections to 

 placing Sowerby's species under any of the numerous genera to 

 which it has been referred, adopted Deshayes' MS. name, and give 

 their reasons in the work above quoted for making a separate genus. 

 On the whole, they were disposed to regard the new genus as being 

 more nearly allied to Natica than to Melania, or Chemnitzia. They 

 make no mention of Oppel as having distinguished the Corallian 

 from the Inferior Oolite form, but observe that M. striata, which is 

 ^ p. 23 of separate memoir. 



DECADE III. — VOL. I. NO. II. 4 



