, GASTEROPODA. 25 
numerous, distant, and elevated—a single one more elevated, being placed at the base of 
each whorl. The longitudinal ribs are occasionally unequal, one unusually large sometimes 
appearing, but not extending beyond the whorl, forming a varix after the manner of 
Triton ; the columella is twisted, turned outwards at the base, and forms, with the outer 
lip, a short oblique channel, which is not perceptible upon the back of the shell; the outer 
lip is thin and dentated externally by the elevated transverse lines. 
Locality. This species is moderately rare; it occurs in the coarse bed of planking 
at Minchinhampton Common, and is seldom well preserved. 
BRACHYTREMA TURBINIFORMIS. Plate IX, fig. 35, 35a. 
B. Testi turbinata, ventricosa, spird elevata; anfractibus 4 angustatis, convexis, nodulato- 
carinatis; ultimo anfractu ventricoso, costulis longitudinalibus ; striis transversis numerosis, 
tmpressis; apertura subrotundd, canali subnullo, columella recta. 
Shell turbinated, ventricose; spire elevated; whorls 4, narrow, convex, their sutures 
deeply impressed, having a nodulated carina; the last whorl is large and ventricose, having 
small longitudinal ribs crossed by numerous transverse strize; the aperture is nearly round, 
the canal reduced to a mere notch; the columella straight. 
This species is chiefly distinguished from its congeners by a greater dilatation of the last 
whorl, which is much expanded transversely. Unfortunately the beds of planking, which 
contain this and various other small univalves with ornamented surfaces, is of so coarse a 
structure, and adheres to the shells with such tenacity, that it is not often that their features 
can be distinguished. Length 6 lines. 
Locality. Minchinhampton Common. 
Famtly—Buccinivz&. 
PurpuroweEa, Lycett. 1848. 
Murex, sp., Sow. 1827. 
Purpura, sp., Buvignier. 1843. 
Purpurrna, sp., D’Orb. 1850. 
P. Testé turbinatd, spird elevatd, aperturdé non longiori, apice subacuto ; anfractibus 
convexis, in medio tuberculatis, anfractu ultimo ventricoso ; basi truncata, apertura sub- 
quadratd, superne acutd, inferne truncata, latd ; canali lato, recurvato ; columella arcuatd, 
rotundatd, levi, basi acuminata, incurvata ; labio effuso, in medio subdepresso, labro tenui 
et sinuato, umbilico obtecto. 
Shell turbimated ; spire elevated, not longer than the aperture, with a somewhat acute 
apex ; whorls convex, nodulated in their middle part, the last whorl ventricose, the base 
