396 W. H. Hudleston—The Yorkshire Oolite. 
10.—Cuemnirzia, cf. coratttina, D’Orbigny, 1850. Plate XIII. 
Fig. 4. 
Chemnitzia corallina, D’ Orbigny, 1850, Terr. Jurass. vol. ii. p. 69, pl. 250, fig. 1, 2. 
Bibliography, ete.—The specimen under consideration represents a 
group of Chemnitzia where the whorl is tumid in the early stages. 
The spiral and sutural angles are such that it might possibly be the 
immature form of Ch. Langtonensis, but this is merely a conjecture. 
_ Description.—Specimen from the Coral Rag of the Malton district 
—most probably from Langton Wold (Leckenby Collection). 
Length (approximate) .......-,..ceeeeee nee 38 millimétres. 
WWAGTIUONE PR Rr reise pMocud dens Sahat oc ana 1. Age 
Length of body-whorl to entire shell ........ 38 : 100. 
Spiral’ anglen Ue lapel see wim tetat creas eine iertcts 20°. 
Shell elongated, conical. The whorls increase under a regular 
angle of about 20°, and are convex, smooth, and devoid of ornament 
beyond the lines of growth, which in this specimen are distinctly 
shown, the surface being well preserved. No punctate striation, 
transverse to the axis, can be discovered. Aperture involved in 
matrix ; anterior extremity apparently oval rather than circular. 
Relations and Distribution.Nothing further can be said on this 
score than what is applicable to species distinguished by a general 
convexity of the whorl, such as may be noted in the descriptions of 
Chemnitzia Clytia, D’Orb., Ch. athleta, D’Orb., and some other forms 
noted by the author of the Terrains Jurassiques. Not any of these 
are identified by Brauns in the Corallian of North Germany, and in 
our Yorkshire beds they are so rare that the specimen figured is the 
only one well preserved which has come under my notice. 
It should be stated, however, that there are specimens in the 
Coral Rag of Ayton and Brompton, having a spiral angle as low as 
16°, which clearly belong to the convex-whorled group, and are very 
like the figure of Ch. Clytia, D’Orb.! 
11.—* PuastaneLta” striata, Sow., 1814. Young specimens. 
Plate XIV. Figs. la, 10. 
Melania striata, Sowerby, 1814, Min. Conch. p. 101, pl. 47. 
Bibliography, etc.—The ‘original figure was made up of two 
Specimens: the lower part from the Coral Rag of Goatacre, the 
upper from a totally different formation at Lymington in Somerset- 
shire, the combined cast being about 8 inches in height. The thin- 
ness of the shell is such that, although it often leaves its mark on 
the cast, whereby we recognize the transverse bands, it is seldom 
that any portion has been preserved. Owing to this circumstance it 
is difficult to say whether the casts so abundant in the Humphresianus- 
zone of the Inferior Oolite at Cheltenham can be deemed specifically 
identical or otherwise with this very characteristic Corallian species. 
A similar form also occurs in the Humphresianus-zone of the Inferior 
| Chemnitzia melanioides, Phillips.—I have hitherto failed to identify this figure 
with any fossil known to me. The original should be at York, but I have not had 
the good fortune to see it. ‘ 
