294 W. H. Hudleston—The Yorkshire Oolite. 
editions, and it has thus been neglected by other English palzonto- 
logists. 
‘In the Terrains J urassiques, vol. ii. p. 206, D’Orbigny identifies 
Natica grandis, Miinst. (see Goldfuss, A.D. 1844, vol. iii. p. 118; pl. 
199, fig. 8), with a shell from the Corallian of the Ardennes, La 
Rochelle, St.-Mihiel and other localities. This shell is figured in 
the Atlas, plate 295. D’Orbigny’s figures and description tally fairly, 
though not exactly with the Yorkshire species now under considera- 
tion, which, if not absolutely identical with the N. grandis of that 
author’s identification, must be viewed as its representative in the © 
Coral Rag of Yorkshire. The species of Goldfuss may or may not 
be the same; it.was found in the Jura Kalke of the neighbourhood of 
Eichstadt, and described in terms so general as to be applicable to 
more than one depressed and globular form. Thus Morris and 
Lycett—Mollusca of Great Oolite, p. 41, pl. vi. fig. 12—record its 
rare occurrence at Minchinhampton. Their figure represents a shell 
which can hardly be the same as the Yorkshire species about to be 
described. To this section of the genus belongs also Natica globosa, 
Roemer, stated by that author to occur in the Portland Kalke of 
Wendhausen. It is probably a still more globular species, and must 
for the present be cancelled from the list of Yorkshire Corallian 
fossils given by me,' and N. buccinoidea, Y. & B., substituted. 
Description—The specimen figured is from the Coral Rag of 
North Grimston (my Collection). 
DLengths(restored))\ p< ecene enerseeeeeeee 59 millimétres. 
Breadth) (restored jwise ee ee een eee 56 Cy, 
Length of body-whorl to entire shell ........ 84 : 100. 
Spiral angles). accu. Was cence paneerere 108°. 
Shell globose, depressed, very slightly longer than wide, nearly 
solid. Whorls four or five in number, the upper ones small and 
rounded ; the body-whorl large and ventricose. The upper whorls, 
as observed in their present condition, are smooth; the lines of 
growth in the body-whorl are well preserved and very conspicuous. 
These decussate with fine transverse lines, and thus produce an 
amount of ornamentation rather unusual in a Natica. Towards the 
middle of the body-whorl is a slight impression, forming a sort of 
helt across the shell, but this disappears in the more adult portion, 
as may be seen on comparing the front and back figures. The 
aperture is extremely wide; the outer lip was in all probability 
semilunar, but the outline is now considerably impaired from unequal 
preservation of the margin. Traces of a thick columellar lip are 
preserved in the upper part, and there is also to be noted in this 
region the commencement of a slight groove, which may have been 
connected in some way with a very slight umbilicus. 
Relations and Distribution.—The affinities of this Naticu have 
already been partly indicated under the heading of Bibliography. 
Its contour and the fine transverse markings of the shell clearly con- 
nect it with the group of which D’Orbigny’s N. grandis and N. Rupel- 
lensis are, in France, the representatives. The Howardian shell seems 
almost intermediate between these two marked Corallian forms. 
1 Yorkshire Oolites, pt. ii. sec. 2. 
