86 
MOLLUSCA. 
Pleurotomaria. 
Shell somewhat depressed; body large, inflated; spire very 
short, consisting of three volutions, terminating in a very acute 
apex; mesial band broad, plain, and investing the body some¬ 
what below the centre; surface covered with fine, regular, spiral 
stria*. 
Found in the Mountain Limestone, Bolland. 
I have altered the specific name, as it was too near slriata, No. 12. 
6. P. sulcata. —The Sulcated Pleurotomaria, pi. XL. 
fig. 7. 
Pleurotomaria sulcata. Phillips, Geo. of Yorkshire, II. p. 
226, pi. 15, fig. 6. 
Shell ovoid; body very large; spire very small, consisting of 
three rounded volutions, with an obscure, nearly central, trans¬ 
verse mesial band; surface invested with numerous, rounded, 
spiral sulci. 
Pound in the Mountain Limestone, Bolland. 
7. P. sulcatula —The Furrowed Pleurotomaria, pi. XL. 
fig. 11. 
Pleurotomaria sulcatula. Phillips, Geo. of Yorkshire, II 
p. 226, pi. 15, fig. 5. 
Shell subdepressed; body large; spire small, conoidal, with 
three slightly inflated, rapidly diminishing volutions, terminating 
in a subacute apex; aperture transversely oblong, much ex¬ 
panded; superior surface spirally furrowed; inferior surface 
with fine concentric stria*; mesial band rather narrow, and 
situate a little below the centre. 
Found in the Mountain Limestone, Bolland, and the Isle of 
Man. 
8. P. expansa. —The Expanded Pleurotomaria, pi. XL. 
fig. 8. 
Pleurotomaria expansa . Phillips, Geo. of Yorkshire, II. p. 
226, pi. 15, fig. 4. 
Shell subconic, depressed; body very large; spire very small, 
consisting of three depressed, gradually decreasing volutions; 
aperture much expanded transversely; mesial band flattened, 
and crossed by arcuated stria*; surface covered with oblique 
stria*, and obsolete spiral stria*. 
Found in the Mountain Limestone, Bolland. 
9. P. lirata —The llidged Pleurotomaria, pi. XL. fig. 
9, 10. 
Pleurotomaria lirata. Phillips, Geo. of Yorkshire, II. p. 
227, pi. 15, fig. 13. 
Shell conical; body large; spire small, consisting of four gra¬ 
dually tapering volutions, terminating in an acute apex; aperture 
nearly circular,slightly pointed above; outer lip plain; inner lip 
narrowly reflected on the columella above, increasing in breadth 
as it descends; mesial band prominent, with arcuated transverse 
stria*; surface above the band with longitudinal, oblique sulci, 
and with straight, longitudinal furrows beneath the band; base 
rounded. 
Found in the Mountain Limestone, Bolland. 
10. P. acuta. — The Acute Pleurotomaria, pi. XL. 
fig. 12. 
Pleurotomaria acuta. Phillips, Geo. of Yorkshire, II. p. 
228, pi. 15, fig. 21. 
Shell ic\ersed, conical; spire consisting of three inflated 
volutions; body traversed at its angle by a short mesial band; 
surface obliquely striated above the carina, and with spiral lines 
below. 
Found in the Mountain Limestone, Bolland. 
11. P. abdita.— The Concealed Pleurotomaria, pi. XL. 
fig. 13, 14. 
Pleurotomaria abdita. Phillips, Geo. of Yorkshire, II. p. 
227, ph 15, fig. 15. 
Shell smooth, subdepressed; body very large; spire very 
small, consisting of three flat volutions, a little rounded at the 
sides, ending in an obtuse apex; aperture large, transversely 
expanded ; outer lip bounded by the band ; inner lip reflected 
m the columella; mesial band broad, flat, and losing itself in 
the suture of the spire. 
Found in the Mountain Limestone, Bolland. 
12. P. striata. —The Striated Pleurotomaiia, pi. XL. fi<r 
L5, 16. 
strictus. Sowerby, Min. Couch. II. p. 159, pi. 171, 
'•£- L 
Shell ctnicai, subdepressed; body large; spire small, consist¬ 
ing of thiee flattened volutions, rounded at the sides; aperture 
suborbicular, occupying more than half the length of the body ; 
an elevated, broad, transverse, mesial band invests the centre of 
the body, and is continued along the base of the volutions of 
the spire, and crossed by arcuated strkc; columella solid; sur¬ 
face covered by oblique, somewhat wide stria*. 
bound in the Mountain Limestone of Derbyshire. 
l.j. P. glabrata. — I he Smooth Pleurotomaria, pi. XL. 
fig. 17. 
Pleurclomaria glabrata. Phillips, Geo. of Yorkshire, II. p. 
229, pi. 15, fig. 28. 
• n °ll depressed, smooth; body large; spire small, with three 
gradually tapering volutions; body rounded at the sides; length 
only about half its diameter; destitute of a band, 
bound in the Mountain Limestone, Bolland. 
LI. 1. flammigera. —The Flame Pleurotomaria, pi. XL 
fig. 18. 
Pleurotomaria flammigera. Phillips, Geo. of Yorkshire, 
II. p. 226, pi. 15, fig. 2. Ib., Treatise on Geology, I. p. 1(33,' 
fig. 11. 
Shell subconic; spire with three moderately inflated volu¬ 
tions; body having a broad mesial band, with arcuated trans¬ 
verse striae; whole surface covered with longitudinal and 
transverse, wide-set striae, producing a fine reticulated appear¬ 
ance; above the band, the surface is covered with handsome 
flame-like, zigzag lines of colour. 
Found in the Mountain Limestone, Bolland. 
15. P. ovoioEA.— 1 he Ovate Pleurotomaria, pi. XL. fitr. 
19. 
Pleurotomaria ovoidea. Phillips, Geo. of Yorkshire, II. p. 
228, pi. 15, fig. 27. 
Shell smooth, ovate, subconic; body large; spire small, con¬ 
sisting of four moderately rounded volutions, subangular below; 
surface w ith flexous lines of growth. 
Found in the Mountain Limestone, in Derbyshire, Bolland, 
Isle of Man, and Ottorburn, Northumberland. 
16. P. IIelicoides —The Ilelix-formed Pleurotomaria, 
pi. XL. fig. 20. 
Pleurotomaria IIelicoides. Phillips, Geo. of Yorkshire, II. 
p. 228, pi. 15, fig. 26. 
Shell smooth, subdepressed; body large; spire small, with 
four rounded volutions, terminating in an acute apex; base 
