MOLLUSCA. 
90 
Shell smooth, nearly hemispherical; body large; spire pretty 
large, produced, consisting of four rather inflated volutions, ter¬ 
minating in a sharp apex; a few indistinct lines of growth. 
Found in the Oolite called (he White Nab, at Cloughton, 
and in the Inferior Oolite Sand called the Blue Wick. 
11. Natica elliptica. —The Elliptical Natica, pi. XLIII. 
fig. 34. 
Natica elliptica. Phillips, II. p. 224, pi. 14, fig. 23. 
Shell elliptical; body very large, covered with fine, oblique 
stria'; spire short, very small, consisting of three greatly de¬ 
pressed volutions, with the apicial one quite obtuse; columella 
plain, and arcuated. 
Found in the Mountain Limestone, in Northumberland, and 
at Bolland. 
12. Natica planispira —The Flat-spired Natica, pi. 
XLIII. fig. 35. 
Natica planispira. Phillips, II. p. 224, pi. 14, fig. 30. 
Shell oblong-ovate; body very large; spire very small, con¬ 
sisting of two well defined volutions, flattened above; aperture 
large, wide, and subquadrate; outer lip much expanded, and 
produced in the centre; columellar lip widely thickened above, 
and narrowing as it descends; umbilicus closed; body flattened 
above, and plic-istriate. 
Found in the Mountain Limestone at Bolland. 
13. Natica hemiclausa —The Half-closed Natica, pi. 
XLIII. fig. 36, 37. 
Natica hemiclausa. Sowerby, V. p. 125, pi. 479? fig. 2. 
Fleming, p. 321. 
Shell smooth, subovate; body very large in proportion to the 
size of the spire, which consists of two very small, ill defined 
volutions; aperture ovate, occupying about two-thirds of the 
length of the shell; outer lip smooth-edged; pillar lip consider¬ 
ably thickened above, narrow beneath, and slightly reflected 
into the moderately-sized umbilicus, which it half closes; it is 
destitute of a spiral ridge; the shell is thickened in the middle, 
and gradually tapers towards the apex, and also towards the 
base, which is somewhat produced. 
Found in the Crag at Woodbridge, Bramcrton, Ipswich, and 
various other places in Sutfolk and Norfolk. 
14. Natica lirata. —The Lyre-shaped Natica, pi. XLIII. 
fig. 38, 39. 
Natica lirata . Phillips, II. p. 224, pi. 14, fig. 22. 
Shell suborbicular; body very large $ spire very small, mam¬ 
millary, consisting of two or three volutions, the lower one large 
in proportion to the others, and terminating in a rounded apex; 
aperture smooth internally, rather large; outer lip greatly ex¬ 
panded; body somewhat flattened above, and the whole surface 
covered with longitudinal, lamellar, raised, thread-like stria), 
resembling the strings of a lyre. 
A variety is found with interlaminar striae. 
This species occurs in the Mountain Limestone at Bolland. 
15. Natica tabulata. —The Tabulated Natica, pi. XLIII. 
fig. 40. 
Natica tahulata. Phillips, II. p. 225, pi. 14, fig. 29. 
Shell oblong-ovate; spire produced, consisting of three volu¬ 
tions, flattened, or tabulated above; body subcylindrical, with a 
subacute base; and its superior portion flattened, and slightly 
oblique, with five longitudinal striic. 
Found in the Mountain Limestone at Bolland. 
Natica. 
16. Natica tumidula— The Slightly-tumid Natica, pi. 
XLIII. fig. 42, 43. 
Natica tumidula. Phillips, I. p. 129, pi. 11, fig. 25. 
Shell smooth, nearly orbicular; body large and tumid; spire 
exceedingly small, consisting of two very ill defined volutions, 
which hardly rise above the body; aperture very large, extend¬ 
ing nearly the whole length of the shell; outer lip sharp at the 
edge; pillar lip broadly reflected on the columella, slightly waved 
on the side next the aperture, the other side considerably in¬ 
dented above, with a large callus, w’hich completely closes the 
umbilicus. 
Found in the Blue Wick, by Mr. Bean, of Scarborough, and 
has also been met with in the Oolite Sand, Somersetshire. 
17. Natica elongata —The Elongated Natica, pi. XLIII. 
fig. 44. 
Natica elongata. Phillips, II. p. 225, pi. 14, fig. 28. 
Shell oblong-ovate; body large, oblique; spire small, con¬ 
sisting of two or three mammillated volutions; surface covered 
with oblique, minute stria). 
Found in the Mountain Limestone at Bolland. 
18. Natica variata— The Variable Natica, pi. XLIII. 
fig. 45, 46. 
Shell subovate, slightly flattened above; spire small, consist¬ 
ing of two volutions, with an acute apex; surface covered with 
stria', which is partly oblique and partly spiral; aperture sub¬ 
oval; outer lip rather expanding; pillar lip broadly reflected on 
the columella; umbilicus closed. 
Found in the Mountain Limestone at Bolland. 
19. Natica striata —The Striated Natica, pi. XLIII. 
fig. 47, 48. 
Natica striata. Sowerby, IV. p. 99? pi. 373, two upper 
figures. Fleming, p. 321. 
Shell smooth, oblong-ovate; spire small, consisting of three 
narrow, but well defined volutions, the apicial one somewhat 
obtuse; aperture, occupying about three-fourths of the length 
of the shell, rounded below, and a little contracted above; outer 
lip blunted at the edge; inner lip broadly reflected on the colu¬ 
mella above, but with a sinus at the umbilical region; umbilicus 
of medium size, open, and destitute of spiral ridges; base con¬ 
centrically striated. 
Found in the London Clay. 
20. Natica depressa. —The Depressed Natica, pi. XLIII. 
fig. 49, 50. 
Natica depressa. Sowerby, I. p. 21, pi. 5, lower figures. 
Fleming, p. 320. 
Shell slightly ovate; spire of medium length, consisting of 
five well defined and rounded volutions, their superior surface 
subtabulated; body volution subcompressed above the centre, 
the top being flattened; aperture slightly ovate, rounded 
below, and slightly contracted above; inner lip rather broadly 
reflected on the columella, and of nearly uniform breadth 
its whole length; umbilicus rather small, oblong, and rather 
shallow. 
Found in the Crag Marl at Woodbridge, Suffolk. 
21 . Natica canaliculata -The Canaled Natica, pi. 
XXXIII* fig. 19, 20. 
Natica canaliculata. Sowerby, Geo. Trans. IV. 2nd series, 
p. 336, pi. 11, fig. 12, and pi. 18, fig. 6. Ampidlaria canalicu¬ 
lata , Mantell, Geo. of Sussex, p. 87? pi. 19? fig. 13. 
