Vol. 58.| REFERRED T0 MURCHISONIA AND PLEUROTOMARIA. 9323 
Diagnosis.—Sheli conical, composed of more than six whorls. 
Whorls increasing gradually, somewhat convex, adpressed. at the 
suture. Band situated on the widest part of the whorl, near the 
middle of the body-whorl, and slightly below the middle of the 
earlier whorls, broad, flat, and rather prominent, margined on each 
side by a fine raised thread. Above the band is a wide, shallow 
groove, of nearly the same width as the band itself; below the 
band is a strong keel which shows just above the suture. Lines 
of growth moderately oblique, curving back to the band above and 
forward again below, where they are strong and thread-like, and 
forming somewhat indistinct crescents on the banditself. Aperture 
longer than wide, columella nearly straight, inner lip spreading 
round its base. Umbilicus closed. Base convex. 
Remarks.—tThis species was first described and figured by 
Sowerby, in Murchison’s ‘ Silurian System,’ as a member of the genus 
Pleurotoma; but his specimen was too imperfectly preserved to show 
much of its real character, merely traces of the band being visible. 
Its specific name evidently arises from its generally occurring 
embedded in coral. ‘The broad, solid-looking band distinguishes 
it from all other species. : 
Localities and Horizon.—The best preserved specimen 
(Pl. VII, fig. 5) with which I have met is in the Grindrod 
Collection, University Museum, Oxford: it is from Upper Ludlow 
rocks, the exact locality of which is not given, but it is most probably 
from the neighbourhood of Malvern. The apex is wanting; the 
remaining five and a half whorls measure 19 millimetres in length 
and 7 mm.in width. The coral in which the shell is embedded is 
labelled Stenopora fibrosa var. incrustans. There are also portions 
of several other examples in this collection from the same strata. 
The type, which is in the possession of the Geological Society, is from 
the top bed of the Aymestry Limestone at Larden: it consists of 
four and a half whorls, the earlier ones also are broken off, and 
those left have a length of 12mm. Other localities recorded in 
the ‘Silurian System’ are Ludlow Promontory ; Fownhope, Botte- 
ville, north side of Caer Caradoc; Aran, near Newnham, north- 
east of Gaerfawe ; and Bradnor Hill, Kington. In the Museum of 
Practical Geology, Jermyn Street, are specimens from Prior Court, 
Hales End, and Frith Farm, Malvern. There are also casts marked 
Murchisonia coralli, from Whitcliff, Ludlow, and Brook Wern, Llan- 
deilo, but they are not well enough preserved for certain identifi- 
cation. The Piper Collection, in the Natural History Museum, 
South Kensington, contains an example from Frith, Ledbury. In 
the ‘ Geology of the Malvern Hills,’ Phillips records this species from 
the following localities :—Malvern District: Overley, Hope End 
Pond, Coomb Hill. Abberley District: Ankerdine Hill. Woolhope 
District: Perton, Pride’s Court, Hayle, Pilliard’s Barn, Bodenham. 
Builth District: Henllwyn Hill, Cwm Craigddu. In all these cases 
the beds in which the fossil was found are of Upper Ludlow age. 
La Touche states that this species occurs in Ludlow rocks at Botville, 
Stoke Wood. M‘Coy says that Murchisonia corallit is found at 
Q.3.G.8. No. 230. zZ 
