W. H. Hudleston—The Yorkshire Oolite. 295 
Neither in the figures of Rémer nor in the lists of Brauns' do we 
find any species from the Corallian of North Germany, which can 
with any certainty be referred to this one. It is equally absent, as 
far as I know, from the Corallian rocks of the rest of England, 
and in Yorkshire has only been found in the Coral Rag of the 
Howardians, where casts of a large depressed Natica are occasionally 
found and the shell sparingly. It is just possible that some of these 
specimens might be referred to N. globosa, Roemer, which Brauns 
places in the Lower Kimmeridge of Hanover, ete. 
4.—Natroa Crymenta, D’Orbigny, 1849. Pl. IX. Figs. 2a. and 2b. 
Natica clymenia, D’ Orbigny, 1849, Prodrome, vol. i. p. 353. 
Natica elymenia, D’Orb., 1850, Terrains Jurassiques, vol. i. p. 201, pl. 292, 
figs. Tand 8. 
Bibliography, ete.—It is not without considerable hesitation that I 
have concluded to rank this fossil as above rather than with Natica 
intermedia, M. & L., which it so much resembles in its proportions. 
The specimen selected is smaller than the usual run of this species, 
which is the most abundant of the genus in Yorkshire. The large 
forms have more resemblance to D’Orbigny’s figure, and there are 
some specimens in the Leckenby Collection referred to N. Clymenia, 
which scarcely differ except in size from the shell now figured by me. 
Whatever name we adopt for this shell, it is essentially median in 
its contour and dimensions, and presents features which are inter- 
mediate between the depressed and elongated Natice. It is, there- 
fore, one of those common.and average forms which are pretty sure 
to turn up on several horizons. 
Description.—Specimen from the Coral Rag of Yorkshire (Strick- 
land Collection). 
herp (wesboned)) }\ psi. ta 8tScaieeicm ales. sta s) a:ayers 47 millimétres. 
PRIMA Pplfcie eRe doaiohaynyare sie ace nis Sd ster 9 dod Gait 3 5 
Length of body-whorl to entire shell ........ 76 : 100. 
RS PETE TELOGe Nees steele ss ancies spate ali cue ciel nieve tee 88°. 
Shell ovate, moderately longer than wide ; whorls, five in number, 
convex, smooth and slightly flattened on the upper margin, but 
becoming less so in the more adult portion of the body-whorl. 
Aperture semilunar, moderately wide, columellar lip thick and 
extended. Slight umbilical notch, which appears to be connected 
with a rugose furrow on the back of the shell. 
Relations and Distribution.—The principal distinction between 
Natica Clymenia and Natica intermedia consists in the slightly more 
sloping character of the whorl in the latter species. D’Orbigny 
describes his shell as having a strongly marked ‘ flat” on the upper 
part of the whorl, whilst the specimen figured by me has only a 
moderate one; the spiral angle and other relative dimensions are 
very nearly the same in both; but N. intermedia is a little less 
globular in outline. 
N. Clymenia is described as an Oxfordian species, and is quoted 
from Neuvisi in the Ardennes, and from Trouville in Normandy. 
The Corallian of North Germany is poorer in Natice than the Coral 
1 Obere Jura. 
