246 W. S. Sudleston — On the Yorlxslnre Oolites. 



the South of England. Amherleya Stricldandi, from the Coral Rag 

 of the Scarborough district (see " Corallian Gasteropoda," Geol. 

 Mag. 1880, p. 536, PI, XVII. Fig. 10), is its representative on a 

 higher horizon. 



Fairly abundant in the Cornbrash of Scarborough. 



53.—" Turbo " sulcostomus, Phillips, 1829. Plate VIII. Figs. 6, 



6a, 7. 



1829. Tttrbo sulcostomus, Ehillips, 6.Y. p. 112, pi. vi. fig. 10. 

 1849. Turbo sulcostomus, Phil. D'Orbigny, Prod. i. p. 333. 



BihliograpJiy, etc. — Stated by Phillips to occur as casts at Hackness 

 and South Cave, and described as having " three or four sharp spiral 

 costai, the right lip grooved vpithin." The type should be in the 

 York Museum, but I have not seen it. D'Orbigny, in describing 

 Turbo Meriani (T. J. vol. ii. p. 355), suggested a connection with 

 T. sulcostomus. 



Description. — Specimen from the Kelloway Rock (Zone 5). 

 Leckenby Collection. Figs. 6a, Qh. 



This fossil is from the red-stained Oolite Grit, and is nearly in 

 the condition of a cast. The spiral angle would probably be about 

 65°. Three complete whorls and part of a fourth remain : suture 

 wide. On the last two whorls traces of 4 spiral bands are visible, 

 the lowest two forming a sort of double keel, the anterior being the 

 most prominent. The spiral bands are continued throughout the 

 base. The fine axial lines of the intercostal spaces are well pre- 

 served in some places. 



Another Specimen. — Same horizon. Bean Collection, British 

 Museum. Fig. 7. 



This also is from the red-stained Oolite Grit, and is marked "Turbo 

 sulcostomus" in Bean's own handwriting. A considerable amount 

 of inner shell-layer yet adheres on the penult, whilst the body- 

 whorl is absolutely stripped, with the exception of a little on the 

 base. This specimen is instructive as showing that the strong spiral 

 bands of the shell produce but little corresponding mark on the 

 internal cast. 



Belations and Distribution. — People might well recoil from 

 attempting to make out the relations of such a fossil as that shown 

 in Fig. 7 ; nor is Phillips's own figure very reassuring, though it is 

 perfectly clear that D'Orbigny was on the right track when he con- 

 nected T. sidcostomus with T. Meriani. That they are absolutely the 

 same one need not suppose, but well-preserved specimens from the 

 Oxfordian of the roches noires present characters which suggest 

 what T. sulcostomus might have been under thoroughly spathic 

 conditions — something in fact between T. Phillipsii and Amberleya 

 armigera. With the latter species also T. sidcostomus has afiinities 

 which the more or less complete destruction of the ornaments seems 

 to mask. It is my belief that if the Kelloway fossil could be obtained 

 in the same condition as the Corubrash one, the differences between 

 them would not be great. 



Not common. 



