296 W. H. Hudleston—The Yorkshire Oolite. 
Rag of Yorkshire, nor does there seem to be any representative of 
this medium-whorled Natica unless it be N. turbiniformis, Roem., 
as quoted by Brauns. As regards distribution in England, N. inter- 
media is stated to be far from abundant at Minchinhampton. In the 
Coral Rag of Yorkshire, both of the Scarborough and Howardian 
districts, the species now under description is the commonest form, if 
one may judge from casts. It certainly occurs along with N. 
buccinoidea in the great shell bed at North Grimston. 
5.—Natica ciyTia, D’Orbigny, 1849. Plate IX. Fig. 3. 
Natica elytia, D’ Orbigny, 1849, Prodrome, vol. i. p. 353. 
Natica clytia, D’Orbigny, 1850, Terrains Jurassiques, vol. ii. p. 200, pl. 292. 
figs. 3 and 4. 
Bibliography, etec.—This belongs to a group of Oxfordian Naticas 
described by D’Orbigny (whose figure differs from his description, 
which consult). 
Description.—Specimen from the Coral Rag of Settrington railway 
cutting (my Collection). 
The fossil being somewhat imperfectly preserved, and slightly 
crushed, no measurements are given; but the following obvious 
points, in which it differs from either of the species already described, 
may be noted. 
The shell is considerably longer than wide; the ratio of the body- 
whorl to the entire length of the shell is less than in either of the 
previously described species, whilst the spiral angle is of lower 
value, indicating a shell which is still median in character, but in- 
clining to the elongated forms. There is no tabulation or “ flatting” 
on the top of the whorls, which slope away regularly from the suture 
with a kind ofdroop. The body-whorl is slightly ventricose (unless 
this appearance is the result of crushing), and the aperture tolerably 
wide. 
Relations and Distribution—The somewhat ventricose character of 
the whorl might induce us to refer this to the species from the Great 
Oolite, where it is described as somewhat rare. The shell under 
consideration is not exactly either N. clytia, or N. formosa. (See 
Morris and Lycett, Mollusca of Great Oolite, p. 42, pl. vi. fig. 10.) 
More typical representatives of N. clytia may be found in the 
Osmington Oolite, and less vigorous ones in the Lower Corallian 
beds of the inland counties. No other specimen of this group of 
Naticas is known to me from the Yorkshire beds. 
6.—Natica arGuTa, Phillips, 1835. Plate IX. Figs. 4, 5a. and 0b. 
Natica arguta, Phillips, 1835. Geology of Yorkshire, vol. i. pp. 101 and 165 
(without figure or description). 
Bibliography, etc.—There has always been some difficulty about 
Natica arguta, as may well be the case when a name is applied to a 
fossilin such a random manner. Phillips refers to Smith’s ‘‘ Strata 
Identified,” where, in the plate entitled “Coral Rag and Pisolite,” 
fig. 2, there is a well-drawn figure of a fossil from the Corallian of 
the South of England, which Smith, at page 20, calls an Ampullaria. 
Smith’s figures do not quite correspond with the specimens now 
under consideration, but as these latter are, in a great measure, in 
