484 W. H. Hudleston—The Yorkshire Oolite. 
C. Michaelense, Buv. (Statis. Géol. de la Meuse, p- 41, pl. xxvii. 
fiz, 30), a shell stated to be rare in the White Oolite of the Coral 
Rag of St. Michel. The specimen now figured and described is 
unique, unless indeed a small specimen found in the Coral Rag of 
Sproxton, and referred to C. Michaelense, belong to the same species. 
23.—CuriTHium GRADATUM, spn. Plate XVI. Figs. 5a, }, c. 
Deseription—Specimen from the Corallian of Yorkshire (Col- 
lection of the Yorkshire Philosophical Society). 
GSES eae erelere cnc oe slaiele leyeswinte ate eels bearer 16 millimétres. 
BW Scltiba ecest lets cleats ievctois, olin erahetaue otel-nettndnteyalet eater 5 
Spiral angle, convex, average .........+-.5. 18° 
Shell but slightly elongated, strongly turrited. Spire consists of 
about eleven or twelve whorls, which are arranged in steps, impart- 
ing a character to the shell suggestive of the name: they are with- 
out visible ornament. The upper half of each whorl is prominent, 
whilst the lower half presents a flat and shallow depression, which 
serves to accentuate the step-like character of each whorl. The 
aperture is subquadrate. 
Relations and Distribution.—Except as regards size this shell has 
a considerable resemblance to a large species named by Buvignier 
(op. cit. p. 41, pl. xxvii. figs. 18 and 14) C. Verdunense, from the 
Upper Coral Rag of Verdun. In the “Corallian Rocks of England” 
a similar fossil from the Coralline Oolite of Ness was so referred, 
but the alternative name gradatum was suggested.’ It is rare. 
24.—CrrirHium tNornatum, Buvignier, 1852. Plate XVI. 
Figs. 6a, 6c. 
Cerithium inornatum, Buy., 1852, Statis. Géol. de la Meuse, p. 41, plate xxvii. 
figs. 17 and 18. 
Bibliography, etc.—Buvignier’s species does not seem to have been 
noted elsewhere on the Continent under that name, though perhaps 
C. autissiodorense, Cotteau, is not so very unlike (see L. & P., Et. 
Supr. Jurass. p. 70, pl. vii. fig. 14). The Yorkshire shell has pro- 
bably been regarded as a Hulima, and it is just possible that the 
Chem. (Terebra) melanioides, Phillips (G. Y. pl. iv. fig. 12), may have 
been intended for it. 
Buvignier himself seems to have had some doubt as to the generic 
classification of his shell, since the aperture was not completely 
entire. Though not shown in his figure, he observes “‘on voit des 
traces de stries transverses.”’ 
Description. Figs. 6a, 6. Specimen from the Coral Rag of 
Seamer (Strickland Collection). 
eneth restored ns atstciaals user hae aeee 33 millimetres. 
BW Witla S200 ro raitzrsdie's feb ianice ay au ae Soaie ey ees oY ec 8 » 
Spiral *anglet neti Mare hee Re Ae Aaa 14°. 
Shell elongated, conical, scarcely turrited. Spire consists of about 
thirteen very flat whorls, which increase under a regular angle of 
14°. These whorls succeed each other like so many straps, the re- 
gularity of increase being very remarkable. In this specimen, which 
is well preserved in calcite, the whorls are slightly bevelled off at 
* Quart. Journ. Geol. Soc. vol. xxxiii. p. 394. 
